I have and ISA 2004 server with SP1 on windows 2003 Server SP1. Until recently the PPTP VPN has worked fine, but since Monday I havent been able to connect and I noticed that I Routing and Remote Access there arent any PPTP listeners created. The clients get error 800 when they connect. I used a packet capture program and I see that the request hits the external NIC of the ISA server and it appears to respond but no connection is made. Any help would be greatly appreciated.