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Troubleshooting a VPN Connection

March 27, 2009

If you are unable to connect to a VPN server, check the following:

Check basic settings such as username, password and host name or IP address. These settings are easy to change, and a single digit or letter error is enough to prevent a successful connection.

Compare the settings used by your VPN client to those expected by the VPN server. Adjust client settings to match those used by the server.

If you use a router to connect your computer to the Internet, make sure the router is configured to provide IPSec and PPTP pass-through. With a Linksys router, check the filters dialog to check these settings. For other routers, check your documentation. If either or both pass-through settings are disabled, you are not able to connect to a VPN server.

If you use a router to connect your computer to the Internet and another user has a VPN connection running, but you can’t connect at the same time, this is normal. Most low-cost routers for home and small office support IPSec and PPTP pass-through for only one user at a time.

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