Windows VPN/RRAS traffic through watchguard

[Danny <nocmonkey () gmail com>]

I thought with firewalls, traffic is either allowed or it's not
allowed. :)  Well, in this case, a Watchguard is connected directly to
the Internet via broadband DSL modem (no router).  Rules on the
Watchguard have been configured to allow PPTP VPN (Windows-based PPTP
VPN, nothing fancy or 3rd party client software) traffic through to an
ISA server.

Now, a VPN "connection" is established from the Internet into the ISA
server without a problem, however VPN traffic through the tunnel does
not work most of the time. It's inconsistent but primarily does not
work.

So, now I try without the Watchguard in the picture, and the tunnel
carries traffic just fine - as it should.

Has anyone ever experience such a problem?

Thank you,

...D
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