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6.0

XP SP2 PPTP VPN problem.

Asked by rmaia in Virtual Private Networking (VPN)

Tags: vpn, pptp, 651, xp

Hi all,

I have a home network (D-Link 624 Router and an Internet cable connection). There is a desktop computer and occasionally I use my work laptop on this network. Both are Windows XP Pro with SP2. Both have ZoneAlarm Pro installed and Windows Firewall disabled.

I used to connect to my company's VPN server (Microsoft's VPN client using PPTP) from the desktop computer without a problem (for more than 1 year). After a minor ZoneAlarm Pro upgrade (it seems to be the only signficant change that took place) my desktop VPN connection started to fail with Error 800. I decided to remove ZoneAlarm and kept Windows Firewall disabled. The problem persisted. I suspected the problem might be related to D-Link router. Upgrade its firmware version and the problem continued to happen. Tried to connect my desktop computer directly to the cable modem and I still get the same error (Although I was able to establish the VPN using IPSec and a Pre-shared key which is not possible behind the router due to NAT issues with IPSec).  If I change the VPN type property from Automatic to PPTP the error change to Error 651 (Modem has reported an error).

The weirdest thing is that I can establish the same PPTP VPN connection from my notebook (XP SP2, behind the same D-Link router, running Zonealarm Pro).

Has anyone seen anything like this ?

An Ethereal trace captured on the desktop computer shows that it can contact my VPN Server (Microsoft Windows 2003 RRAS on an ISA 2000 Server), establish the TCP connection (port 1723), exchange a couple of PPTP messages and then stops (closes the connection with a sequence of FINs and RST packets).

Thansk for your help,

Renato Maia
Brazil
 
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Zone: Virtual Private Networking (VPN)
Tags: vpn, pptp, 651, xp
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