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Vista can't establish L2TP/IPSec connection to ISA error 809

RRAS, VPN, TS/RDP, Routing and remote Access.

Vista can't establish L2TP/IPSec connection to ISA error 809

Postby chicagotech » Wed Dec 12, 2007 2:02 pm

Q: The L2TP/IPsec VPN connection does not work from Windows
Vista to ISA server with error 809.

A: According to the description of the Error 809, the network connection
between your computer and the VPN server could not be established because
the remore server is not responding. This could be because one of the
network devices (e.g firewalls, NAT, routers etc.) between your computer
and the remote server is not configured to allow VPN connections.

To isolate the problem, there is some question I need to know.

Q1. Do you have the same issue connecting to the VPN server from other
machines likes Windows XP, Windows2000?

Q2. Can you establish the remote access VPN PPTP connection?

Q3. As you mentioned in your email, you have issued a certificate on the
Vista laptop. Have you issued a computer certificate to the ISA firewall?
As we know, the secure IPSec solution is to use computer certificates on
the VPN server and VPN clients. The first step is to issue a computer
certificate to the ISA firewall

You can get more information of configuring VPN connection from the below
links.

How to configure a VPN server by using Internet Security and Acceleration
(ISA) Server 2006 or ISA Server 2004
http://support.microsoft.com/kb/837355/en-us

How to use virtual private networking to join or access an internal domain
from an external client by using Microsoft Internet Security and
Acceleration (ISA) Server 2006 or in ISA Server 2004
http://support.microsoft.com/kb/838239/en-us
Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
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Postby dimas » Sat Jan 12, 2008 1:03 pm

I`ve same problems with VPN connections on Vista HP. There is no problems on XP SP2.
It`s L2TP/Ipsec with pre-shared key connections to ISA 2004.

My answers a questions:

q1 - i`ve only 1 router with right settings because XP connects w/o problems
q2 - i can establish the remote access VPN PPTP
q3 - no certificates. only pre-shared key

I think L2TP/Ipsec settings in Vista has corrupted... or certificate is strict required
dimas
 
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Postby chicagotech » Sat Jan 12, 2008 2:11 pm

For troubleshooting, please start the Vista with clean boot. this how to may help. Please post back with the result.

Troubleshooting Vista with clean boot
How to run Windows OS with a clean ...How to run Windows OS with a clean boot ... when you cannot determine the cause of the issue, you may run Windows Safe ...
www.chicagotech.net/netforums/viewtopic.php?t=778
Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
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Postby dimas » Sat Jan 12, 2008 3:59 pm

I think it will not resolve a problem but i`m trying

Does Vista support l2tp/ipsec with pre-shared key?

It might be some fixes... or it not might...
dimas
 
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Joined: Sat Jan 12, 2008 12:43 pm


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