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PPTP won't pass through ISA2004 + Firebox X Edge

I'm having trouble getting PPTP traffic to pass through a Watchguard Firebox X Edge (on the remote side) and ISA 2004 (on my side) to a Windows 2003 RRAS box.

I can connect fine if I bypass the ISA server on my side, and similarly I can connect successfully through the ISA to many other PPTP VPN servers (including ones that are behind other Watchguards...).

It seems this particular combination of Watchguard and ISA 2004 doesn't pass PPTP through. I get error 691 on the VPN client and the Watchguard logs "deny in eth0 40 tcp 20 237 <ISA 2004 IP> <VPN internal IP> 40392 1723 ack rst (Non-est TCP)"

An extensive search of the web has shown a number of people with this issue on various combinations of firewalls...only changing the firewall at one end appears to help but I'd rather avoid that.

Any ideas?
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nigelmh
Asked:
nigelmh
1 Solution
 
Rick HobbsRETIREDCommented:
Your only option is to see if there is updated software for the Watchguard.  Some combinations just do not work and if you work out the number of hours you spend trying to fix it by your hourly rate you will probably find it is a lot cheaper to replace it than continue to fight it.   I would still check the software update first.  Sometimes it is a known problem that is addressed in an update.  You could also call Watchguard as they may know about the problem and have a non-public fix for it.
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nigelmhDirectorAuthor Commented:
You're right Rick. It wouldn't be so bad if the Watchguard didn't insist on using Watchguard's own VPN client to connect to it, but 'no client software deployment' is an absolute requirement in this case, so I can't go to the Watchguard and now I can't go through it!

I'm thinking of replacing it with a Checkpoint Safe@Office. I'm just hoping that won't break the two s2s vpn tunnels connecting it to their other offices...
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