Is this being installed on a 64bit machine? If yes - stop, we don't support 64bit. Are you installing this on any version other then RTM? If yes - Do a clean install of Vista RTM before installing the client. Are you installing this on an upgraded installation of Vista? If yes - Do a clean install of Vista RTM before installing the client. Did you run the vpnclient_setup.msi file to install the client? If yes - Rerun the installer using the downloaded vpnclient-win-msi--k9-x86.exe or vpnclient_setup.exe. Currently the .MSI file isn't Vista compatible. If you are getting an error message saying that the client is unable to enable the virtual adapter do the following: 1. Check to see if the Virtual Adapter is installed. Open Device Manager and look under Networking to verify if the Virtual Adapter is installed. If not run the following command in the VPN Client directory: vainstaller.exe i "C:\Program Files\Cisco Systems\VPN Client\setup\netcvirta.inf" CS_VirtA If this doesn't show the Virtual Adapter, uninstall the client and reinstall the client with MSI logging enabled. See below for info. Then email the MSI log and the DNE log to vista-vpn@cisco.com. 2. Manually enable the Virtual Adapter and attempt to connect. If the adapter will not enable do the following: If this doesn't show the Virtual Adapter, uninstall the client and reinstall the client with MSI logging enabled. See below for info. Then email the MSI log and the DNE log to vista-vpn@cisco.com. Are you getting a firewall error message and being disconnected? Vista client currently doesn't install the integrated firewall, disable or create a new group that does not check for the firewall on your headend. Additional things to keep in mind: Client currently does not support certificate authentication, Start Before Login, integrated firewall, 64bit, .MSI and logging is limited to file only and will not show up in the display window. To enable MSI logging please see: http://support.microsoft.com/kb/223300 The DNEinst.log is located in: c:\windows\temp\dneinst.log To enable Verbose logging of the client for troubleshooting connection related issues do the following: 1. Open the GUI and enable logging. Then close the GUI. 2. Open the vpnclient.ini file located in c:\program files\cisco systems\vpn client\vpnclient.ini and change the following loglevels to 15, IPSec, CVPND and IKE. Save and close the file. 3. Open the GUI and attempt to connect. Once you have run into the issue close the GUI and send the logs in c:\program files\cisco systems\vpn client\logs\* to vista-vpn@cisco.com. At minimum try the following before contacting vista-vpn@cisco.com: Reinstalled the client, if the problem persists reinstall Vista RTM cleanly then the client and see if the problem still persists. After reinstalling the client go ahead and email vista-vpn@cisco.com with the information regarding the issue. We do require the problems to be reproducable which means reinstalling Vista cleanly and then the client and seeing if the problem still persists. Please include in your email to vista-vpn@cisco.com the following: State the problem, and the steps you took to run into the problem. What version of Vista and the client you have installed. ie Vista Business 32bit. Steps you have taken to troubleshoot. Install log and DNE log.