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Error 800 in windows 2003 VPN

Posted on 2004-09-20
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Last Modified: 2012-05-05
Hi,
I am trying to set up a vpn using windows 2003 server. I set up the VPN server on the 2003 machine and  and vpn client on Win XP pro. I have a dynamic IP so i use a dns alias. I configured my router to allow port 1723 for vpn. Since i dont have a static IP this is the format my dns alias is http://mydomain.dnsalias.net/.
My question is why cant i connect, i'm getting a error 800. Second question...should i be using http://mydomain.dnsalias.net/ for host name or http://mydomain.dnsalias.net:1723?

Please help
thank you,
a
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Question by:mrperfect75000
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Sebo2000 earned 125 total points
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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This issue may be caused by a router that has outdated firmware.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

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by:mrperfect75000
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i tried that , now i get an error 721, the computer is respomding. I try it again and its error 800 again. Dont know what i'm doing wrong. If i use my internal IP and try it from another computer connected to the router it works.
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