No response from VPN server

[jmsabatini]

I have a Win2K server set up on a small switch between our AdTran and NetScreen for VPN functionality. When I put a client machine on the same switch as that server, I can easily connect through the VPN to our internal network. When I try to access the VPN from the outside (and hence the traffic has to go through the AdTran), I cannot connect. I know that the server is receiving 3 packets on TCP port 1723 before my external client gives up, but the Network Monitor trace shows that nothing is being sent back to my client. Any ideas? Thanks.

 

[John Lewis]

In addition to TCP traffic on 1723, you need to pass protocol 47 (GRE).