From: Vienna, VA USA
hi, I need some help with the Cisco VPN client. We have a customer site that we need to get connectivity to and they are having us connect using the Cisco VPN client (version 3.5) on Windows 2000 Pro. We have been able to successfully connect when we are outside the LAN. However, the ISA server is blocking something when we try to connect from inside the LAN. Can anyone give me any detailed instructions on what ports to open etc? Or can anyone point me towards some good documentation? I looked all over Cisco's website and looked here and on microsoft but I am new at this so I am a bit confused. I keep getting "remote peer is no longer responding" and "remote peer terminated the connection" errors. I tried
Interesting that the Firewall client had to be disabled. Since UDP is being used, it would make sense that the FW client is picking up the packets. But what is it that the FW client does with the UDP messages that breaks the link?
very good question! It's a pitty I cann't test it myself
Maybe it has something todo with how the IPSec client is hooked into the TCP/IP stack. I think it is *not* at the WinSock level, but more likely at the NDIS level as a pseudo NDIS driver. However, the firewall client is working at the WinSock level. So, if he intercept the packets, they will never hit the proper NDIS driver. Just a guess...