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Table Of Contents

Release Notes for Cisco VPN Client, Release

These release notes address the following subjects:


•New Features

•System Requirements

•Installation Notes

•Advisories for Windows 7 and Vista Users

•Usage Notes

•Known Caveats

•Resolved Caveats

•Related Documentation


These release notes are for the Cisco VPN Client, Release The names of the files on the software download site are:

•vpnclient-win-msi- for Windows on x86 (32-bit).

•vpnclient-winx64-msi- for Windows on x64 (64-bit).

The VPN Client creates a secure connection over the Internet between a remote PC and an enterprise or service provider Cisco VPN device. This connection lets you access a private network as if you were an on-site user.

This document identifies the new features, system requirements, limitations and restrictions, known issues, resolved caveats, and related documentation. Please read it carefully prior to installation. The section, 'Usage Notes,' describes interoperability considerations and other issues you should be aware of when installing and using the VPN Client.

New Features

VPN Client 5.0.07 features the following:

•Support for Windows 7 on x64 (64-bit). This release, however, does not support WWAN devices (also called wireless data cards) on Windows 7 x86 (32-bit) and x64. For support of WWAN devices on Windows 7, please use the Cisco AnyConnect Secure Mobility client.

•Support for Windows Vista on x64.

•Packet LZS compression for x64 VPN Client.

Note that this version does not provide online help.

System Requirements

Cisco VPN Client 5.0.07 supports the following Microsoft OSs:

•Windows 7 on x64 (64-bit)

•Windows 7 on x86 (32-bit) only

•Windows Vista on both x86 (32-bit) and x64

•Windows XP on x86

VPN Client does not support the Tablet PC 2004/2005; and Windows 2000, NT, 98, and ME.

VPN Client supports smart card authentication on Windows 7, Vista, and XP. However, VPN Client does not support the ST Microelectronics smart card Model ST23YL80, and smart cards from the same family.

VPN Client supports up to one Ethernet adapter and one PPP adapter. It does not support the establishment of a VPN connection over a tethered link.

VPN Client 5.0.x is incompatible with the combination of Cisco Unified Video Advantage 2.1.2 and McAfee HIPS Patch 4 Build 688. To avoid system failures, uninstall either of these two applications, upgrade McAfee to the latest version, or use VPN Client 4.6.x.

To install the VPN Client, you need

•Pentium®-class processor or greater

•Microsoft TCP/IP installed. (Confirm via Start > Settings > Control Panel > Network > Protocols or Configuration.)

•50 MB hard disk space.

•128 MB RAM
(256 MB recommended)

•Administrator privileges

The VPN Client supports the following Cisco VPN devices:

•Cisco Series 5500 Adaptive Security Appliance, Version 7.0 or later.

•Cisco VPN 3000 Series Concentrator, Version 3.0 or later.

•Cisco PIX Firewall, Version 6.2.2(122) or Version 6.3(1).

•Cisco IOS Routers, Version 12.2(8)T or later.

Downloading the Latest Version

To download the version of AnyConnect, you must be a registered user of

To obtain the AnyConnect software, follow these steps:

Step 1 Follow this link to the Cisco AnyConnect Secure Mobility Client Introduction page:

Step 2 Click Download Software.

Step 3 Click Cisco VPN Client v5.x in the third column of the table under 'Make a selection to continue.'

Step 4 Click Yes in response to the prompt, 'Do you want to view only the webpage content that was delivered securely?'

Step 5 Enter your credentials.

Step 6 Ensure the Latest Releases folder is open.

Step 7 Click Download Now next to the associated name of the .exe file.

Cisco Vpn Client Windows 64 Bit Download

Step 8 Click Proceed with Download.

The webpage displays a link to the Cisco End User License agreement.

Step 9 Read and verify the download rules below the link, then click Agree.

Step 10 Click Download next to 'Cisco VPN Client v5.x.'

Installation Notes

Refer to 'Cisco VPN Client User Guide for Windows, Chapter 2, for complete installation instructions for Windows users.

Note Due to issues surrounding network installation, Active Directory Group Policy software deployment is no longer supported. For more information and a workaround, refer to open caveat CSCse00525.

Installation Notes - Windows Platforms

Please note the following installation considerations for Windows users.

Installation Error 1720

If a 1720 error occurs during the installation of the VPN Client, please use the Microsoft WMI Diagnosis Utility to check the WMI status.

Please contact Microsoft if the utility reports errors.

vpnapi.dll File Installs in Wrong Directory (Windows 7 x64 Only)

If you install VPN Client onto Windows 7 x64, move the vpnapi.dll file from the %SystemRoot%Program Files(x86)Cisco SystemsVPN Client directory to the %SystemRoot%SysWOW64 directory. Otherwise, applications that use the VPN Client API cannot do so.

Default Location for VPN Client Registry Values on Windows 7 x64

The default location of all VPN Client registry values for Windows 7 on x64 (64-bit) is:


Avoiding Vista Problems with the TCP/IP Registry Compatibility Service and the VPN Virtual Adaptor

To avoid problems with the TCP/IP Registry Compatibility service and the VPN Virtual Adaptor, we strongly recommend that Windows Vista users install Vista SP2 or later.

For more information about a previous hotfix for this problem, go to this URL:

Upgrading from Windows XP Requires a Clean Installation

After upgrading Windows XP to Windows 7 or Vista, one experiences various problems with the VPN Client, ranging from client not logging, client won't connect, virtual adapter not installing, and so on. Upgrading from a clean install of Windows XP to Vista has been tested and the VPN Client does work in this situation.

However, upgrading a Windows XP installation with legacy applications ranging from Firewalls, Antivirus, device drivers, and so on to Windows 7 or Vista is not supported, because the problems stem from the legacy applications no longer supported by the OS.

Installing the VPN Client Software Using the MSI Installer

You can use the MSI installer on Windows 7, Vista, and XP. Installing with MSI requires administrator privileges.

Before installing the Windows MSI installation package, you must manually uninstall the previous VPN Client if it is older than Release 4.7. The MSI installer does not uninstall the older versions; it attempts to install before aborting gracefully. Once a version 4.7 MSI package has been installed on Windows XP, future client versions can detect the release present and automatically begin the uninstallation process.

Upgrading the VPN Client Software on Windows 7 and Vista

For Windows 7 and Vista, please use add/remove programs to uninstall the VPN Client before upgrading to a new Client release.

Using the VPN Client

To use the VPN Client, you need:

•Direct network connection (cable or DSL modem and network adapter/interface card), or

•Internal or external modem

To connect using a digital certificate for authentication, you need a digital certificate signed by one of the following Certificate Authorities (CAs) installed on your PC:

•Entrust Technologies (

•Netscape (

•Verisign, Inc. (

•Microsoft Certificate Services — Windows 2003

•Microsoft Certificate Services — Windows 2000

•Digital certificate stored on a smart card (supported only on Windows Vista and XP at this time). The VPN Client supports smart cards via the MS CAPI Interface.

The VPN Client accepts a blank password for certificate retrieval, but should not.

About Version Numbers

VPN Client software uses an all-numeric version numbering system to facilitate the automatic update function. Release numbers are represented in the format:

<major release>.<minor release>.<sustaining release>.<build>

The major and minor release numbers represent the feature level of the product. Major and minor releases implement new product capabilities. The sustaining and build release numbers represent significant or minor patch levels, respectively. For example, represents feature release 5.0.01, build 600.

All sustaining and build releases are cumulative; however, we do not release all build numbers. The build number for this release is

Advisories for Windows 7 and Vista Users

Windows 7 and Vista users should be aware of the following characteristics of the Cisco VPN Client.

Secondary IP Address Used for VPN Session with Windows 7

On Windows 7, the Cisco VPN Client uses the primary IP address of an interface during the VPN session setup. However, if the same interface has a secondary IP address, the VPN Client uses the secondary IP address to transmit all traffic once the session is established.

Connection Time

Using the VPN Client to connect a PC running Windows 7 or Vista system might take longer than one running Windows XP. The actual time it takes to connect might vary from customer to customer.

IPv6 Resources Accessible on LAN

Windows 7 and Vista users who establish a VPN Client connection can use IPv6 to access resources on the LAN, regardless of whether split tunneling is configured. By default, Windows 7 enables IPv6. The only workaround is to disable IPv6 on the endpoint. This issue applies to all VPN Client releases that support Windows 7 and Vista.

Unsupported Features

The Cisco VPN Client for Windows 7 and Vista does not support the following features:

•Upgrade from Windows XP (clean OS installation required).

•Start Before Logon

•Integrated Firewall



Usage Notes

This section lists issues to consider before installing VPN Client Release 5.0.07.

In addition, you should be aware of the known caveats in this release. Refer to 'Known Caveats' on page 17 of this document for the list of known problems.

Note Support for this release is provided through the Cisco TAC for customers with SMARTnet support contracts.

VPN Client May Not Work Properly After Laptop Wakes up from Suspend Mode

The Cisco VPN Client may not work properly on a laptop after it wakes up from suspend mode. If a VPN 4.8 (or later) Client is connected to a central site-device, and the client device (typically a laptop) goes into Suspend Mode, then the VPN Client disconnects. Upon waking up from Suspend Mode, the VPN Client is disconnected. A pop-up message appears, allowing you to reconnect the VPN connection. However, selecting reconnect may not re-establish the VPN tunnel.

This situation occurred with the VPN 4.8 Client installed on a Windows XP Laptop. The client disconnects after going into any hibernate or standby situations.


This behavior was tracked with the defect ID CSCsf96588 and resolved; however, Cisco cannot guarantee that this solution will work on all hardware platforms and operating systems. You may still encounter the behavior described in CSCsf96588 when running Cisco VPN client version 4.8 and later. If you do see the behavior described in the defect, use the following workaround:


Disconnect the Cisco VPN session before going into Hibernate or Standby Mode. When you awaken your computer, re-establish the Cisco VPN session. Use one of these methods to disconnect the Cisco VPN Client:

•Open the Cisco VPN Client on the desktop, select the connection entry and click Disconnect.

•Right-click the Cisco VPN client icon in the system tray and click Disconnect.

•Open Windows Task Manager, click the Processes tab, and end the vpngui.exe process.

Cannot Connect to ASAs Using the Same FQDN with TCP

VPN Client cannot complete a VPN connection if it is using IPsec over TCP and two or more ASAs are using the same FQDN.

As a workaround, use IPsec over UDP or plain IPsec, or upgrade to Cisco AnyConnect Secure Mobility client, release 2.5(3), 3.0(2), or later.

VPN Connection Retained When Switching Users

If one user uses VPN Client to establish a VPN connection and another user uses the Switch User feature to log into Windows, the second user also has access to that connection. As a workaround, upgrade to the Cisco AnyConnect Secure Mobility client.

Split DNS with Wildcards

A split-dns value containing wildcards can cause a system failure when a Windows user accesses certain URLs. For example, the split-dns value a,b,c,d,e,f,g,h,i,j,k,l,m,no,p,q,r,s,t,u,v,w,x,y,z can cause a system failure. To avoid these failures, move the VPN adapter to the top of the binding order list of network adapters. Note that Split DNS requires entries only for internal domains.

Potential Compatibility Issues

You might encounter the following compatibility issues when using the VPN Client with specific applications. Whenever possible, this list describes the circumstances under which an issue might occur and workarounds for potential problems.

Windows Interoperability Issues

The following known issues might occur with the indicated Microsoft Windows operating systems and applications software.

Microsoft Internet Connection Sharing Incompatible

The VPN Client is not compatible with Microsoft ICS (Internet Connection Sharing (ICS) on the same PC.

Wireless Hosted Network Feature Incompatible with VPN Client

The VPN client can become unstable when using the Wireless Hosted Network feature in Windows 7. Therefore, when using the VPN Client, we do not recommend enabling this feature or running front-end applications that enable it such as Connectify or Virtual Router.

VPN Client Cannot Launch Microsoft Connection Manager

The VPN Client does not detect a dialup connection made with Microsoft Connection Manager because of incompatibilities between the requirements of the two applications.

Microsoft MSN Installation

Microsoft's MSN installation fails if you have already installed the VPN Client. Uninstall the VPN Client before you install MSN. After MSN has completed installation, you can install the VPN Client.

WINS Information Might Not Be Removed from Windows Servers If Not Disconnected Before Shutdown

If the VPN Concentrator is configured to send WINS server addresses to the VPN Client and the PC is shut down or restarted without first disconnecting the VPN Client, the WINS servers are not removed from the network properties. This might cause local PC registration and name resolution problems while not connected with VPN.

To work around this problem, do one of the following:

•Be sure to disconnect the VPN Client before shutting down. If you are having problems, check your network properties and remove the WINS entries if they are not correct for your network.

•Alternatively, enable 'Disconnect VPN connection when logging off'. Go to Options > Windows Logon Properties, check Disconnect VPN connection when logging off.


For DNS resolution, if the DOMAIN NAME is not configured on the network interface, you must enter the fully qualified domain name of the host that needs to be resolved.

Network Interfaces

•The VPN Client does not support Point-to-Point Protocol over ATM (PPPoA).

•The VPN Client cannot establish tunnels over Token Ring. However, it does not conflict with an installed Token Ring interface.

•The VPN Client on Windows 7 does not support WWAN devices (also called wireless data cards).

Microsoft Outlook Error Occurs on Connect or Disconnect

The following Microsoft Outlook error might occur when the VPN Client connects or disconnects:

'Either there is no default mail client, or the current mail client cannot fulfill the messaging request. Run Microsoft Outlook and set it as the default mail client.'

This message does not affect operation of the VPN Client. The issue occurs when Microsoft Outlook is installed but not configured for email, although it is the default mail client. It is caused by a Registry Key that is set when the user installs Outlook.

To eliminate this message, do one of the following:

•Right-click the Outlook icon, go to Properties, and configure it to use Microsoft Exchange or Internet Mail as the default mail client.

•Use Internet Explorer to configure the system to have no default mail client.

•Configure Outlook as the default mail client.

Adjusting the Maximum Transmission Unit (MTU) Value - Windows Only

VPN Encapsulation adds to the overall message length. To avoid refragmentation of packets, the VPN Client must reduce the MTU settings. The default MTU adjusted value is 1300 for all adapters. If the default adjustments are not sufficient, you may experience problems sending and receiving data. To avoid fragmented packets, you can change the MTU size, usually to a lower value than the default. To change the MTU size, use the VPN Client SetMTU utility. If you are using PPPoE, you may also have to set the MTU in other locations. Refer to the following table for the specific procedures for each type of connection.

The MTU is the largest number of bytes a frame can carry, not counting the frame's header and trailer. A frame is a single unit of transportation on the Data Link Layer. It consists of header data, plus data that was passed down from the Network Layer, plus (sometimes) trailer data. An Ethernet frame has an MTU of 1500 bytes, but the actual size of the frame can be up to 1526 bytes (22-byte header, 4-byte CRC trailer).

Recognizing a Potential MTU Problem

If you can connect with the Cisco VPN Client but cannot send or receive data, this is likely an MTU problem. Common failure indications include the following:

•You can receive data, such as mail, but not send it.

•You can send small messages (about 10 lines), but larger ones time out.

•You cannot send attachments in email.

Setting the MTU Value

If you do not experience a problem, do not change the MTU value. Usually, an MTU value of 1300 works. If it does not, the end user must decrease the value until the Cisco VPN Client passes data. Decrement the MaxFrameSize value by 50 or 100 until it works.

The following table shows how to set the MTU value for each type of connection.


Physical Adapters

Use the SetMTU utility supplied with the Cisco VPN Client.


Use the SetMTU utility supplied with the Cisco VPN Client.

PPPoE - All Vendors

Use SetMTU.

Cert DN Matching Cannot Match on Email Field EA

You cannot match the Cert DN field (EA) when using the Peer Cert DN Verification feature on the VPN 3000 Concentrator because the VPN 3000 Concentrator does not assign a value to that field.

VPN Dialer Application Can Load During OS Shutdown or Restart

When using the VPN Client Start Before Logon feature in 'fallback' mode, the VPN dialer application loads during a shutdown or restart of the operating system. This does not cause any problems and can be ignored.

America Online (AOL) Interoperability Issues

The following interoperability issues apply to AOL dialup connections only.

AOL Versions 5.0 and 6.0

The VPN Client supports AOL Version 5.0. AOL Version 6.0 is also supported, with one limitation: when connected, browsing in the network neighborhood is not available.

AOL Version 7.0

AOL Version 7.0 uses a proprietary heartbeat polling of connected clients. This requires the use of split tunneling to support the polling mechanism. Without split tunneling, AOL disconnects after a period of time between 5 and 30 minutes.

AOL 7 Disconnects after VPN Authentication

When making a dialup connection with AOL 7.0 Revision 4114.537, then attempting to connect with the VPN Client, AOL might disconnect while the user is being authenticated. This is an AOL issue, not a VPN Client problem (CSCdy45351).

VPN Client Fails to Connect over Some AOL Dialup Connections

The Cisco VPN Client connecting over an AOL dialup connection fails to complete the connection, particularly when using AOL 7.0 and 8.0.

The AOL dialup process uses a fallback method which, if your initial attempt to connect fails, resorts to a different connection type for the second attempt. This second attempt can sometimes cause AOL to communicate over two PPP adapters (visible in ipconfig /all output). When this happens, the VPN Client cannot connect. This is a known issue, and AOL is investigating the problem.

To work around this issue, try to reconnect the dialup connection and try to avoid getting two PPP adapters.

ZoneAlarm Plus Versions 3.1.274 and Earlier Are Incompatible with VPN Client

The following known incompatibility exists between the Cisco VPN Client and Zone Labs ZoneAlarm Plus version 3.1.274 and earlier. If you are using such a version of ZoneAlarm Plus, please visit or contact your Zone Labs representative for an update.

On a PC with ZoneAlarm Plus version 3.1.274 (or earlier) and the VPN Client, errors similar to the following occur when the PC boots:

ZAPLUS.exe has generated errors and will be closed by Windows. You will need to restart the program.

An error log is being generated.

The Application Log records a message similar to the following:

The application, ZAPLUS.EXE, generated an application error. The error occurred on 7/23/2002... The exception was c0000005 at address 00401881 (<nosymbols>).

The result of such errors is that the ZoneAlarm GUI does not run, and therefore a user cannot change any settings in ZoneAlarm Plus or allow new programs to access the Internet. (CSCdy16607).

CheckPoint ZoneAlarm (Integrity Agent) Is Incompatible with VPN Client

The VPN Client is not compatible with the software firewall provided with ZoneAlarm (Integrity Agent) v8.0.298. (CSCtc46109)

Auto-update Package No Longer Supported

VPN Client does not support the auto-update package for versions higher than

Close Client before Hibernation

Windows 7 and Vista leave the client hanging while it attempts to disconnect upon awakening after hibernation. To avoid this issue, close the client interface before hibernation and reopen it upon awakening.

Upgrading Zone-Alarm Pro to Version 3.7.098 Causes Error When VPN Client Is Already Installed on the PC

Upgrading ZoneAlarm Pro version to ZoneAlarm Pro version 3.7.098 when the VPN Client is installed on the PC might cause the following error to appear:

'The procedure entry point DbgProcessReset could not be located in the dynamic link library VSUTIL.dll.'

Click OK. The installation continues. See ZoneLabs bug number 10182.

DHCP Route Renewal

If the public network matches the private network (for example, a public IP address of, with a subnet mask of, and an identical private IP address) and the public network route metric is 1, traffic might not be tunneled to the private network. The same problem can occur if you are using a virtual adapter and the public metric is smaller than the virtual adapter metric.

In Windows 7 and Vista, you can increase the metric of the public network as follows:

Step 1 Select Start > Control Panel > (Network and Internet) > View Network Status and Tasks.

Step 2 Right-click the icon representing the public interface and select Properties.

Step 3 Select Internet Protocol Version 4 and click Properties.

Step 4 Click Advanced in the General tab, and set the interface metric to 2 or greater.

In Windows XP, you can increase the metric of the public network as follows:

Step 1 Select Start > Settings > Control Panel > Network and Dial-up Connections.

Step 2 Select the public interface and click properties for the public interface.

Step 3 Select Internet Protocol (TCP/IP) and get the properties for the Internet Protocol (TCP/IP).

Step 4 Click Advanced, and set the interface metric to 2 or greater.

Windows XP Only—Data Meant for Private Network Stays Local if VPN Client Local Network Is on Same IP Subnet as Remote Private Network

This problem occurs only with the VPN Client, Release 4.6 and only with Virtual Adapter on Windows XP when the VPN Client local network is on the same IP subnet as the remote private network. When a VPN connection is up, data meant for the private network stays local. For example:

Beginning with VPN Client, Release 4.6, the Virtual Adapter attempts to modify local route metrics to allow data to pass over the VPN tunnel. In some cases, it is impossible for the VPN Client to make this modification.

To work around this problem, make the change manually, using the following procedure:

Step 1 Run > Control Panel > Network and Dialup Connections.

Step 2 Right-click on the adapter in question and select Properties.

Step 3 From the Adapter Properties dialog, select TCP/IP from the list and click Properties.

Step 4 Click Advanced and increase the number in the 'Interface metric' box by 1 (it is usually 1, so making it 2 works).

Step 5 Click OK to exit out of all dialogs.

Step 6 The VPN connection should now work.

DNS Server on Private Network with Split DNS Causes Problems

When an ISP DNS server is included in the Split Tunneling Network List and Split DNS Names are configured, all DNS queries to domains other than those in the Split DNS Names list are not resolved.

By definition, split DNS is used so that only certain domains get resolved by corporate DNS servers, while rest go to public (ISP-assigned) DNS servers. To enforce this feature, the VPN Client directs DNS queries that are about hosts on the Split DNS Names list to corporate DNS servers, and discards all DNS queries that are not part of the Split DNS Names list.

The problem is when the ISP-assigned DNS servers are in the range of the Split Tunneling Network List. In that case, all DNS queries for non-split-DNS domains are discarded by the VPN Client.

To avoid this problem, remove the ISP-assigned DNS server from the range of the Split Tunneling Network List, or do not configure split DNS (CSCee66180).

No Limit to Size of Log File

When logging is enabled on the VPN Client, all of the log files are placed in the Program FilesCisco SystemsVPN Clientlogs directory and are date and time stamped. There is no limit to the size of the log when logging is enabled. The file will continue to grow in size until logging is disabled or the VPN Client program is closed. The log is still available for viewing until the VPN Client program is re-launched, at which time the display on the log tab and log window are cleared. The log file remains on the system and a new log file is created when the VPN Client, with logging enabled, is launched.

Start Before Logon and Microsoft Certificate with Private Key Protect Fails

Trying to connect the VPN client using Start Before Logon (SBL) and Microsoft Machine-based certificates fails. This failure is a Microsoft issue, not a VPN Client problem.

If your certificate has private key protection enabled, every time you use the certificate keys you are either prompted for a password to access the key, or notified with a dialog and asked to click OK.

The prompt displayed when using a certificate with private key protection appears on the Windows Desktop. You do not see this message while at the Logon desktop, therefore the VPN Client cannot gain the access to the certificate needed to connect.

Use one of the following workarounds:

•Get a certificate without private key protection. Make sure it is machine-based; otherwise it will not be accessible before logging on).

•Instead of using Start Before Logon, log on to the PC using cached credentials, make the VPN connection, and— using the 'stay connected at logoff' feature—logoff/logon with the VPN established to complete the domain logon.

Linksys Wireless AP Cable/DSL Router Version 1.44 or Higher Firmware Requirement

To use the VPN Client behind a Linksys Wireless AP Cable/DSL router model BEFW11S4, the Linksys router must be running version 1.44 or higher firmware. The VPN Client cannot connect when located behind a Linksys Wireless AP Cable/DSL router model BEFW11S4 running version 1.42.7 firmware. The VPN Client may see the prompt for username/password, then it disappears.

VPN Client Can Require Smart Card When Using Certificates

You can configure the VPN Client to require the presence of a smart card when certificates are used. If this feature is configured, the VPN Client displays an error message if a smart card is not present. The certificates need not be present on the smart card itself. To configure this feature, add the following line to the user's client profile, specifying the appropriate vendor for your smart card:

SmartCardName=<Name of Smart Card Vendor>

If you are using pre-shared keys instead of certificates, this requirement is not enforced, even if configured.

To disable the smart card verification function, completely delete the entry: SmartCardName=<text> from the user's client profile (CSCec82220).

Allowing ICMP Traffic to Pass Through the Firewall

The following configurations allow inbound ICMP packets (pings) when the default firewall rule for the Centralized Protection Policy (CPP) is pushed to the VPN Client.

On the VPN Client:

•Stateful Firewall (Always On) is enabled.

•The setting 'StatefulFirewallAllowICMP=1' is added to the [Main] section of the vpnclient.ini file.

•A connection is made to the VPN Concentrator that pushes the default CPP firewall rule to the VPN Client.

Use the parameter, 'StatefulFirewallAllowICMP=1'only if you want to allow ICMP traffic to pass through the firewall.

Use Zone Labs Integrity Server or Higher with VPN Client 4.0

Versions of the Zone Labs Integrity Server earlier than exhibit the following problem. If two or more VPN Clients running on Windows XP are connected to a VPN 3000 Series Concentrator and receive firewall policy from a ZoneLabs Integrity Server, the Integrity Server registers only one connection.

On the Integrity Flex (client agent), under 'Policies', the 'Integrity Server' column flashes 'Connected' then 'Disconnected' over and over. The VPN Client log also includes the following event: 'The firewall, configured for Client/Server, returned a status of lost connection to server.' Zone Labs Integrity Server version fixes this issue.

Restart VPN Client Service if You Install VPN Client before Zone Alarm

The firewall enhancement, 'Prevent VPN Traffic Blocking', automatically adds the Loopback address ( and the address of the VPN 3000 Concentrator to the ZoneAlarm or ZoneAlarmPro trusted zone.

Check Point Integrity Firewall Incompatibility

Cisco VPN Client may not start if the Check Point Integrity personal firewall is running. Either shut down the Integrity client (iclient.exe) or disable its firewall.

Caution Do not disable the firewall if you are using the ZoneAlarm firewall.

To disable the Integrity firewall, rename or delete the following files, then reboot:




VPN Client cTCP Connection Fails If Checkpoint Client Is Installed

When the Checkpoint VPN-1 SecuRemote client is installed with the 4.6 or higher VPN Client, and the VPN Client attempts to connect using cTCP, the VPN Client cannot make the connection. Connections do work with UDP, NAT-T, and non-NAT connections.

To make a connection with cTCP when the Checkpoint VPN-1 SecuRemote is installed, you must disable the Check Point SecuRemote driver in the Connections Properties. To do this, you must be administrator. Follow these steps:

Step 1 Click Start > Settings > Control Panel >Network and Dial-up Connections.

Step 2 Select the Local Area Connection you use.

Step 3 Click on File > Properties.

Step 4 Uncheck Check Point SecuRemote, and click OK.

Installing the VPN Client on a Japanese System Using MSI

Follow these steps to install the VPN Client on a Japanese system, using Microsoft Installer:

Step 1 Extract the file vpnclient-win-msi- to any folder.

Step 2 Execute vpnclient_setup.msi. The installer runs in English.

Step 3 After installation is complete, modify vpnclient.ini as follows: ClientLanguat=jp

Step 4 Launch the VPN Client.

Duplicate IP Address Triggers Error 442 on Windows 7 and Vista

The following error 'Reason 442: failed to enable virtual adapter' appears after Windows 7 and Vista reports a duplicate IP address detected. Subsequent connections fail with same message, but the OS does not report a duplicate IP address detected.

To work around error 442, do the following steps:

Step 1 Open 'Network and Sharing Center'.


Step 2 Select 'Manage Network Connections'.

Step 3 Enable the Virtual Adapter ('VA'—Cisco VPN Adapter).

Step 4 Right-click on Cisco VPN Adapter and select 'Diagnose' from the context menu.

Step 5 Select 'Reset the network adapter Local Area Connection X'.

If this procedure does not work, run the following command from cmd:

reg add HKLMSystemCurrentControlSetServicesTcpipParameters /v ArpRetryCount /t REG_DWORD /d 0 /f

Then reboot.

This resolves the issue until the OS reports a duplicate IP address again. Follow the preceding steps to resolve it again.

If that doesn't work, you might have UAC enabled. If so, you must run cmd as administrator and repeat the previous registry workaround.

Windows 7 and Vista Window Auto-tuning Feature Might Cause Network Timeout Problems

Windows 7 and Vista support a feature called 'Receive Window Auto-Tuning' that continually adjusts the receive Windows size, based upon the changing network conditions.

Some people reported that auto-tuning causes network timeout problems with some applications and routers. If you have experienced such problems, you can turn it off using the following procedure:

Step 1 Open an elevated command prompt.

Step 2 Enter the following command to disable auto-tuning:

If this solution does not fix the problem, you can turn it back on, as follows:

Step 1 Open up an elevated command prompt.

Step 2 Enter the following command to enable auto-tuning netsh interface tcp set global autotuninglevel=normal

To view the states of the TCP global parameters, use the following command:


Windows Vista Error 412

When running under Windows Vista, you might encounter error 412: The remote peer is no longer responding.

To work around this error, upgrade the local NAT device firmware. If this is not possible, switch to TCP. If switching to TCP is not possible, use the following keyword in the connection profile (*.pcf):


Note If you are using Domain Isolation, you cannot use the UseLegacyIKEPort keyword, as this conflicts with Microsoft Domain Isolation.

Known Caveats

Caveats describe unexpected behavior or defects in Cisco software releases.

Note If you have an account with CCO, you can use Bug Navigator II to find caveats of any severity for any release. To reach Bug Navigator II on CCO, select Software & Support: Online Technical Support: Software Bug Toolkit or navigate to

Table 1 shows all Severities 2 and 3 caveats known to be in Release

Table 1 Known Caveats



Local DNS server contacted for FQDN in Split-DNS domain


Auto Initiation fails on 9x/Vista on boot up


unity client disconnect-verizon evdo/at&t 3G card changed IP


unity vista: user not prompted to reconnect after sleep or hibernation


unity vista: firewall tab under stats still shows


unity vista: installshield package does not work on vista


unity vista: error 1721 when installing client on vista 64bit


unity vista: upgrading from xp to vista not supported


unity vista: bsod during install/uninstall/sleep with active ras


unity vista: integrated firewall not installed on vista


unity vista: start before login 'sbl' not functioning


unity windows silent msi upgrade not


Cisco VPN Client incorrectly using the secondary IP address for VPN


VPN Client unable to validate certificate chain

Resolved Caveats

Table 2 shows the caveats that Release 5.0.07 resolves.

Table 2 Resolved Caveats



unity xp-vista: reauth on rekey with saved password causes disconnect


VPN client does not handle IP option properly under Vista


IGMP packets from the Vista discovery service are getting encapsulated


SetMTU needs to support Dial-Up Networking on Vista.


ENH: unity client with SBL shows error message with firewall detected


VPN Client can't connect for certain period after forcible termination


VPN Client will not connect to headend if PCF is read only


PC reboots if physical link is disrupted during a VPN connection


x64 Vista: Error 442 failed to enable VA during the 1st connect attempt

Related Documentation

Cisco Security Appliance Command Line Configuration Guide, Version 8.0

Cisco Security Appliance Command Reference, Version 8.0

•ASDM Online Help

ASDM 6.0 User Guide

•Cisco AnyConnect VPN Client Administrator Guide

VPN 3000 Series Concentrator Reference Volume I: Configuration, Release 4.1

VPN 3000 Series Concentrator Reference Volume II: Administration and Management, Release 4.1

VPN 3000 Series Concentrator Getting Started, Release 4.1

This document is to be used in conjunction with the documents listed in the 'Related Documentation' section.

Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its affiliates in the U.S. and other countries. To view a list of Cisco trademarks, go to this URL: Third-party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (1110R)

Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.

© 1999-2011 Cisco Systems, Inc. All rights reserved.

Having been discontinued back in 2011, it shouldn’t come as a shock that the Cisco VPN client isn’t supported by Windows 10. In fact, you would be lucky to get it working with Windows 8.1 since Cisco itself has stated in the past that the last supported operating system for its VPN client was Windows 7.

Nevertheless, there is a well-known, but somewhat vexatious, workaround that will get the client working on up to the Windows 10 Creators Update released back in the spring. It hasn’t been confirmed whether this loophole will work stably with the latest Windows 10 Fall Creators Update, released earlier this year, though, so your best bet is to avoid updating for now in this case.

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Otherwise, you can do what Cisco itself recommends and download the Cisco AnyConnect Secure Mobility Client v4.x, which handles VPN functions in addition to offering a wide range of extra features such as malware protection. The problem is that some people don’t want all of the fluff and would rather keep on keepin’ on with their existing VPN client.

For those users, we suggest you follow this guide to its celebratory end to get the now-defunct Cisco VPN client working with a version of Microsoft’s desktop operating system that’s still regularly supported by its maker – namely Windows 10.

Installing the right programs

Okay, it’s time to get the Cisco VPN client up and running with Windows 10. We’ll restate this point just to make it doubly clear: this is only confirmed as working with builds up to version 15063 of Windows 10, or the Creators Update.

What’s more, it’s suggested that you uninstall the Cisco VPN client before you dare install Windows 10 Creators Update. If you don’t, you might wind up scrambling around for the proper registry files to delete before your system will let you install the product again using the MSI file we’ll discuss later on. So if you haven’t already, uninstall the Cisco VPN client now.

Now let’s download and install the SonicWall VPN client found here. In doing so, you’ll want to ensure the Windows executable you retrieve is the latest version of either the 32- or 64-bit client or it might not work as anticipated. After that, download the Cisco VPN client itself from Dropbox, but we couldn’t get a download to initiate from the latter (perhaps you’ll have more luck).

If you opt for the Dropbox route, make sure you select ‘Direct download’ rather than ‘Save to my Dropbox’. Note that you don’t have to sign up for a Dropbox account to access this file despite the web client prompting you to. In fact, you can continue to download the Windows executable installer without signing up for a new account or logging into an existing one.

With the EXE file downloaded, you’re going to have to make some changes before you can actually perform an installation of the Cisco VPN client. First off, you’re probably going to run into an error claiming that the file isn’t supported by your version of Windows.

To bypass this, unzip the file using file compression software like WinZip or 7-Zip and extract it to some place memorable like your desktop. Then, if you’re like us, you’ll encounter another issue: the freshly unzipped file will be an unopenable MST file, which luckily we have a stupidly easy fix for. Right click and change the MST portion of the file name to MSI – it’s that simple.

From there, double-click the newly converted vpnclient_setup.msi to finally begin the install wizardry. Click Next until you’re finished, then, as instructed, click Finish.

Editing the registry

Once you’ve made your way through the Cisco VPN client install wizard, it’s time to break out everyone’s favorite registry editor, namely Regedit. In Windows 10, you can access Regedit by typing it into the search bar (to the right of the Start button) or by using the shortcut Win + R and typing Regedit there. Whatever your preference, open Regedit.

Next – you guessed it – you’re going to make a quick registry edit. At one time, this step was optional, but since the Creators Update arrived, it’s pretty much mandatory in most cases.

With Regedit open, locate the registry key HKEY_LOCAL_MACHINE and click the drop-down icon. Then do this again for System, CurrentControlSet, Services, and finally, CVirtA.

From there, double-click DisplayName and change the value data to “Cisco Systems VPN Adapter” (without quotes) if you’re using the x86 32-bit version of the software or “Cisco Systems VPN Adapter for 64-bit Windows” (again, without quotes) if you’re on the 64-bit version.

For reference, the original value data entry should look like this:

32-bit (x86): @oem8.ifn,%CVirtA_Desc%;Cisco Systems VPN Adapter

64-bit (x64): @oem8.ifn,%CVirtA_Desc%;Cisco Systems VPN Adapter for 64-bit Windows

Once you’ve made the appropriate changes to your registry, restart Windows and you’re done.

The Cisco VPN client should now work as expected in Windows 10. However, if you’re continuing to run into trouble, we have a few extra steps you can take in the section below dedicated to troubleshooting.

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Troubleshooting and post-installation

If you’re still having trouble installing, running or using the Cisco VPN client with Windows 10, our best advice is to backtrack.

Most commonly, users will neglect to install the SonicWall client first, resulting in Error 433 when they try to connect. If this is happening to you, go back and install SonicWall prior to the Cisco VPN client, so that you have a DNE Lightweight filter ingrained in your system.

Once you’ve gone through and installed both programs – unzipping and renaming the Cisco VPN client installer in the process – edited the registry and rebooted your machine, you can go ahead and remove SonicWall in Settings > Add or remove programs, or in Control Panel > Programs > Programs and Features. Restart your computer again and the Cisco VPN client should still work.

If you’ve done everything in this guide (and in your power) to get the Cisco VPN client up and running in Windows 10 with no success, as a last resort you can reset all networking in Windows 10. This can be accomplished rather effortlessly.

First, run Command Prompt with administrative privileges by right-clicking it in the search bar and selecting “Run as administrator.” Then type “netcfg -d” (without quotes). Press enter. Reboot. That’s all there is to it.

If you’re still having issues, feel free to contact the author on Twitter and we’ll do what we can to help.

Cisco Vpn Client Windows 7 64 Bit Download

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