PPTP VPN stops working on XP SP3

[Aviator Rob]

I have 2 PPTP VPN connections to remote customer sites that for whatever
reason have decided to stop working. I get one error of 619 and the other
721. The odd thing is that I can connect to these two with the same setup on
another XP and Vista machine. So the trouble is unfortunately on my work
notebook. L2TP connections and Cisco VPN connections are not affected, only
the PPTP.

Each one will show the indicator that it is verifying username and password
but will go no further. I believe that the process is stuck trying to
establish a connection and just does not complete. I have recreated the two
connections on the notebook and met the same results.

I have already recovered this notebook once to factory defaults, and do not
wish to do the same should I have to.

Can anyone help me ferret out the issue, or has seen this happen to PPTP
connections? I can tell you that each VPN is connecting to a firewall device,
one an IBM ISS box and the other a Fortigate.

I cannot stress enough that the problem is local to my notebook, since I can
connect using other systems with my credentials.

 

[net gym]

I am having the exact same issue. lots of post have pointed to GRE, firewall
and virus proctection disables of course none of these help. has anyone found
a solution for this?

 

[net gym]

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.