MSVPN and FTP

Today I came across a wierd problem with a client connected to a Microsoft VPN server not connecting to third party FTP server.

The environment is a Windows 2003 server with the latest service packs applied.

It turns out that for all traffic floating from the client except for the FTP traffic originates with the client IP. All FTP traffic originates with the VPN Server IP address. As a result you will have to adjust your firewall accordingly.