VPN Connection Issues

[Nikumba]

At work we have been running a VPN server on Windows 2003 happily for some time, however over the last few days some people can not log in, they get Error 800 when trying to connect, the problem is we have users logging in fine to the VPN. We are using a Cisco 1700 supplied by our NTL

Any help is appricated.

Cheers

[Avatar261]

did you try to conenct to that server with IP insted of dns name, maybe your dynamic DNS is refreshing slowly. Check your dsl/router/modem if it supports VPN.
You might also check this KB article:

KB319108

Error Message: VPN Connection Error 800: Unable to Establish Connection
View products that this article applies to.
This article was previously published under Q319108
SYMPTOMS
When you try to establish a virtual private network (VPN) connection, you may receive the following error message:

Error 800: Unable to establish connection


CAUSE
This issue may be caused by a router that has outdated firmware. For example, this issue may occur if you are using a Cisco router with firmware that is dated 2000 or earlier.

To verify that this is the cause, look at a network trace. The Cisco device advertises a 0 window size in the TCP handshake on port 1723.
RESOLUTION
To resolve this issue, contact the manufacturer of the router for possible upgrades. For information about how to contact the manufacturer, click the appropriate article number in the following list to view the article in the Microsoft Knowledge Base:
65416 Hardware and Software Third-Party Vendor Contact List, A-K

60781 Hardware and Software Third-Party Vendor Contact List, L-P

60782 Hardware and Software Third-Party Vendor Contact List, Q-Z

MORE INFORMATION
For additional information about how to configure VPN connections in Windows XP, click the article numbers below to view the articles in the Microsoft Knowledge Base:
314076 HOW TO: Configure a Connection to a Virtual Private Network

305550 HOW TO: Configure a VPN Connection to Your Corporate Network in Windows XP Professional


Also check that any local firewalls are permitting conenctions

[Nikumba]

We only connect to the VPN server by IP address the server has a static IP.

We know its not a firmware issue since other users are logging onto the VPN fine

Nikumba