Cannot connect to Remote Desktop

[kaoboda]

I have a branch office that has several PCs running XP. They have hardcoded IPs provided by the ISP and they use the Internet to VPN back to our offices here. We have a primary VPN server (Running 2003 Enterprise) and a backup (Running 2000 Advanced Server, soon to be 2003 Enterprise).

1. When the computer is not connected to the VPN, with just the ISP hardcoded IP, I am able to connect to the PC via Remote Desktop just fine.

2. When the computer is connected to the Backup VPN, thus getting a local IP, I am able to connect to the PC via Remote Desktop just fine.

BUT

3. When the computer is connected to the Primary VPN, thus getting a local IP, I am unable to connect to the PC via Remote Desktop.

Has anyone had similar experience or know why this occurs? Is there a setting in Windows 2003 that needs to be changed to allow for access?

Please help!

 

[kaoboda]

Okay.

Further testing shows that I can VNC or Remote Desktop to the machine when connected to the 2003 VPN, but only from the VPN server itself.

However, I can VPN/Remote Desktop to the machine from any machine on my network when connected to the 2000 VPN box.

Any ideas?