Our client is running VPN server on Windows 2008 server. All users and computers can establish the VPN except one XP laptop. Here are symptoms on this computer. 1. When trying to establish their company VPN, the computer gets error 638. 2. If we setup a VPN to access my company VPN running on windows server 2008, it works. 3. On the same XP computer, if I establish the VPN to my company VPN server first and then connect to their company VPN that works fine (meanng there are two VPN connections). 4. If I try clean boot on the computer, the VPN to their company error is 800. 5. I have deleted and all VPN settings and re-do it, but that doesn’t help. 6. I can telnet port 1723 from the computer. 7. The VPN serer doesn't have any related errors in the Event Viewer. Any suggestions? Bob Lin, MVP, MCSE & CNE Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net How to Setup Windows, Network, VPN & Remote Access on http://www.howtonetworking.com

Your're in the wrong forum, this is for exch try the windows forum http://social.technet.microsoft.com/Forums/en-US/categories I think XP support is finished http://support.microsoft.com/lifecycle/?LN=en-gb&C2=1173 Sukh

Hi, If your xp version is SP3 you can check this forum:(Any previous xp versions are not supported) http://social.technet.microsoft.com/Forums/en-US/itproxpsp/threads Note: please read annoucement firstly. Best Regards!Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.