Windows 2003 VPN won't respond to packets forwarded by Linux router

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From: Steve Protter (anonymous_at_discussions.microsoft.com)
Date: 07/28/04 

Date: Wed, 28 Jul 2004 07:57:53 -0700

My front end to the Internet is Linux. For a while I had
forwarded VPN traffic to a Windows 2000 Pro workstation.
But it only allowed one vpn connection.

So we got Windows 2003 Server put it in the same ip
address and went through the standard vpn configuration.
No response to the packets or a 781 error, complaining
about a missing certificate.

We issued our own certificate and ran packet dumps, but
the server simply does not respond. See this thread for
details:
http://forums1.itrc.hp.com/service/forums/questionanswer.do
?threadId=624076

Mentioned articles here are:
http://support.microsoft.com/default.aspx?scid=kb;en-
us;247231

and

http://support.microsoft.com/default.aspx?scid=kb;en-
us;329858

Seems like we have a problem with Windows 2003 server.
I've disabled the firewall completely but it doesn't want
to respond to authentication requests. I simply don't
believe the VPN clients complaint about a certificate
being missing. You have to respond to the packets and this
box simply won't do that. I've proven that with packet
dumps. Because the VPN forwarding scheme did work with
2000 Pro, the problem seems to be the W2K3 box.

Also, note that on the internal network, VPN connections
work just fine.

SEP

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