Solved

L2TP VPN RRAS Demand Dial

Posted on 2006-11-29
4
1,381 Views
Last Modified: 2012-06-27
Hello

I'm trying to do something simple however it has turned into something complicated. I have two sites and trying to create a VPN tunnel using RRAS server. PPTP is working fine however If I try to switch it to L2TP I get security errors in event viewer like below:

A Demand Dial connection to the remote interface REAL VPN on port VPN2-4 was successfully initiated but failed to complete successfully because of the  following error: The L2TP connection attempt failed because security negotiation timed out.

It has to be something simple...anyone have any ideas? I have the approrpiate 1701 UDP port forwarded.

Regards

Dan

0
Comment
Question by:dcarrion
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
4 Comments
 

Author Comment

by:dcarrion
ID: 18043153
Okay I followed some instructions which shows how to setup L2TP to use preshared key with RRAS. This involves setting registry key for ProhibitIpSec to 1 and setting a preshared key authentication in the mmc snapin. I can connect locally but when I try to connect over the internet it chucks an error back.

I have forwarded port 500 and 1701
0
 
LVL 2

Accepted Solution

by:
The_Maverick earned 500 total points
ID: 18043368
I've had a bit of a wrestling match over the last week with L2TP. Needing the pre-shared key was one trap (I see that you've already discovered that one) - the other "gotcha" (got me anyway!) was that, apparantly, you can't use L2TP if it's going through any kind of NAT or NPT router (which I was).

Not sure if this applies to you or not, but thought it might help.

Also, have a read of ...

http://support.microsoft.com/default.aspx/kb/259335

Cheers,

Mav.
0
 

Author Comment

by:dcarrion
ID: 18044138
I think the problem I am having is that I am trying to use IPSec VPN behind NAT on a windows 2000 RRAS server. Apparently this doesn't support the new NAT-T (transparent) features...I guess I'm going to have to move onto windows server 2003 RRAS server or hardware VPN routers... thanks anyway guys...any other suggestions please let me know.
0
 
LVL 2

Expert Comment

by:The_Maverick
ID: 18050644
Thanks "dcarrion" :)

I was trying to impliment mine on a Windows Server 2003 R2 Box, but had to settle for PPTP in the end - reading through the MS article that I posted the link for I was left with the impression that it was the NAT box (Zyxel Router) that was doing the corrupting of the packets, but I could be wrong.

I suppose you know that you can download a 6 month trial of WinSvr 2003R2 from MS for nothing to try?

Cheers,

Mav
0

Featured Post

Don't Cry: How Liquid Web is Ensuring Security

WannaCry is just the start. Read how Liquid Web is protecting itself and its customers against new threats.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Meet the world's only “Transparent Cloud™” from Superb Internet Corporation. Now, you can experience firsthand a cloud platform that consistently outperforms Amazon Web Services (AWS), IBM’s Softlayer, and Microsoft’s Azure when it comes to CPU and …
During and after that shift to cloud, one area that still poses a struggle for many organizations is what to do with their department file shares.
Here's a very brief overview of the methods PRTG Network Monitor (https://www.paessler.com/prtg) offers for monitoring bandwidth, to help you decide which methods you´d like to investigate in more detail.  The methods are covered in more detail in o…
This video gives you a great overview about bandwidth monitoring with SNMP and WMI with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're looking for how to monitor bandwidth using netflow or packet s…

707 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question