Vpn error 789


T

totomaster

Hi

I'm trying to connect to a l2tp vpn and I receive the error 789 : The l2tp
connection attempt failed because the security layer encountered a processing
error during initial negotiations with the remote computer

This error appeared since yesterday, before I was fine.

I try with my windows xp computer and i'm able to connect

Thanks
 
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R

Robert L. \(MS-MVP\)

In many cases, VPN error 789 is security settings or 3rd party software
issue. For troubleshoot it, start the Vista with clean boot.

windows faqsHow to run Windows OS with a clean boot How to stop the
Messenger Service ads How to tell who is logged on at a remote computer ...
www.howtonetworking.com/winfaqs.htm


--
Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on
http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on
http://www.HowToNetworking.com
 
J

Jian-Ping Zhu [MSFT]

Hello,

Thanks for your post.

I need to collect more information before going further. Please help answer
the following questions.

1. Did you configure the L2TP/IPSec connection by using pre-shared key or
certificate for authentication?

2. Did the issue also occur on other Vista machines?

3. If possible, to narrow down the issue, could you please try PPTP VPN on
the same Vista machine and check whether this works?

4. Please tell me the information of VPN server and provide the detailed
VPN settings on server side. (Please tell me detailed parameters of IPsec
settings )

Thanks for your time and I look forward to hearing from you soon.

Sincerely,
Neo Zhu,
Microsoft Online Support
Microsoft Global Technical Support Center

Get Secure! - www.microsoft.com/security
=====================================================
When responding to posts, please "Reply to Group" via your newsreader so
that others may learn and benefit from your issue.
=====================================================
This posting is provided "AS IS" with no warranties, and confers no rights.
 
J

Jian-Ping Zhu [MSFT]

Hello,

Regarding your last email , I am just check and follow-up on your status.

I was wondering , if you were available to try conduct test and answer my
questions.

Thank you for your time and attention.

Sincerely,
Neo Zhu,
Microsoft Online Support
Microsoft Global Technical Support Center

Get Secure! - www.microsoft.com/security
=====================================================
When responding to posts, please "Reply to Group" via your newsreader so
that others may learn and benefit from your issue.
=====================================================
This posting is provided "AS IS" with no warranties, and confers no rights.
 
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M

Marek Godlewski

I have the same problem, except I am using certificates for authentication. I
have tried to restart both mentioned services. Everything worked fine before.
I am able to estabilish this L2TP/IPsec connection using Windows XP on the
other computer.

The MS IPsec Diagnostic Tool says:

WFPUtil Diagnosis:
....
Information: The log events indicate failed negotiation
Analysis Report: IKE/Authip Main Mode Failure
Error: 0x00003601, No policy configured.
Host machine is indicating error. The authentication method used is Unknown
Failed: IKE negotiation failed. SA could not be established
--1. Check if both machines have matching filter operations, Encryption
options
--2. Check if both machines have matching Unknown settings

Please Help!
Marek Godlewski
 
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