Thanks for the suggestion.
Both machines are Windows XP, which have PMTU Discovery enabled by default.
This also does not explain why it works fine with the GNATBox firewall.
----- Original Message -----
From: "edward mzj" <edward dot mzj at gmail dot com>
To: "Jeff Scott" <scott at advbiol dot com>
Cc: <m0n0wall at lists dot m0n0 dot ch>
Sent: Tuesday, March 21, 2006 10:06 AM
Subject: Re: [m0n0wall] PPTP Client behind m0n0 = Remote Desktop
try to turn on 'path mtu discovery' on both windows host.
search msdn for the howto