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Windows L2TP to ASA5520 Trouble


I have the following issue:

I have a client that HAS TO use the detault windows L2TP protocol to connect to our office.

He can not use the cisco client.

I am having trouble creating the VPN for L2TP.

The configuration file is attached below.

On the Windows side:

I have created a new VPN connection called DefaultRAGroup with the ip address of my host

Under the security tab i have the following selected:

Advanced (custom settings)

--> Require Encryption (disconnect if server declines)

--> Allow these protocols



The IPSec pre-sared key I have entered the key.

For username i have steve@DefaultRAGroup and in the password field i have steve's password.

The attached "log.txt" file are the errors that I see when I am viewing the Real-Time Log Viewer:

The Windows side error message I am getting is:

Error: 789: The L2PT connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer.

Can someone shine a light on this situation? It's the only thing holding me back from making this router live.

Thank you in advance!

  • VPN
Cisco Employee

Re: Windows L2TP to ASA5520 Trouble

Please add the following ISAKMP policy and test it again:

crypto isakmp policy 5
authentication pre-share
encryption 3des
hash sha
group 1
lifetime 86400

Hope that helps.

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