VPN failure for only one client. XP SP3 -> 2003 ISA server

[net gym]

I have just one client that is not connecting to the ISA server.
XP SP3 using default windows VPN client (connect to a network)

I have tried turning off the firewall and virus protection but still get the
721 error while connectiong

for responses using the pptpclnt client we get the ussual working responses.

<paste>
Successfully connected to server using TCP port 1723 (PPTP)
Sending data to server

Waiting for a reply to the data which was just sent...
<end paste>
waits 30 seconds here
<paste>
Recieved a reply. Reply contains the following text:
--->

===========================
Connectivity test to TCP Port 1723 was successful!!!
Closing down the socket...
===========================

Createing a socket to test GRE protocal traffic...

Total GRE Packets sent = 1
Total GRE Packets sent = 2
Total GRE Packets sent = 3
Total GRE Packets sent = 4
Total GRE Packets sent = 5

===========================
Check server to see if the GRE packets were recieved successfully
===========================

Closing down socket

Goodbye!
<end paste>

on the ISA server monitor I get

PPTP Initiated connection
<wait 30 seconds>
PPTP closed connection

5 GRE responses with
Unidentified IP Traffic (GRE:0) Denied Connection default rule

<end ISA server monitor>

other clients have no problem connecting it is just this one client.

when I try to connect to the localmachine using pptpsrv in another window I
get the same thing with the exception of

<paste>
Recieved a reply. Reply contains the following text:
--->Hello, there! This is a reply from the server.
<end paste>

 

[net gym]

was able to get this computer functioning again by removing Cisco's VPN
client running a registry cleaner. verifying that connection would work
again. then reinstalling Cisco VPN client and again verifying that it still
works.

 

[Robert L. \(MS-MVP\)]

Thank you for the update.

--
Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on
http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on
http://www.HowToNetworking.com