Win98 can't connect to certain IP via RRAS VPN on Win2k server

[buddersworth]

This is really bizzare.
Win2k server with RRAS installed.
Win2k and XP VPN clients are fine.
When connected to VPN, Win98 and ME can't connect to

http://www.orbitz.com,

for example.
They can ping and the IP address is resolving fine.
Can't connect by IP address (65.216.67.100) either.
They work fine with remote gateway off.

Installed all the lastest SP and updates to no avail.
Set up another test server and have the same problem on that.

Does this ring a bell with anybody???