Question : XP SP3 VPN failure (not GRE issue) to ISA server.  error 619 ir 721

I have just one client that is not connecting to the ISA server.
XP SP3 using default windows VPN client (connect to a network)
of course user says there was nothing changed on his machine since it worked last.

there is nothing between the ISA server and XP machine on
the same outside subnet to test so there is no firewall out there between the
2.

I have tried turning off windows firewall and virus protection but still get the
721 or 619 error while connectiong

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


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

Waiting for a reply to the data which was just sent...

waits 30 seconds here

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!


on the ISA server monitor I get

PPTP Initiated connection

PPTP closed connection

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



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


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


I have tried the "netsh int ip reset c:\resetlog.txt"  and no love there either.

the Cisco client VPN works fine with no issues. but windows VPN has lost the ability to connect to any server. other computer with similar settings works with no problems at all so I know its on the client machine.
 

Answer : XP SP3 VPN failure (not GRE issue) to ISA server.  error 619 ir 721

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.