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ISA 2004 L2TP VPN using Certificates

Posted on 2011-09-28
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Last Modified: 2012-05-12
Hi Guys,

Trying to get L2TP (certifcates) to work between my VPN clients and ISA2004 server.

Have the following:

My own CA server on Domain X
My ISA server is stand-alone (not part of the domain)
Windows XP / 7 clients

Have installed a CA certifcate in the Trusted Root of ISA.  (This works fines as I use it for SSL traffic for OWA client -> ISA -> Exchange)

Using the CA web page http://local_ip/certsvr I have install a user certifcate on my client machine.

I have setup ISA to accept L2TP and use certifcate authentication.
I have setup the client to use L2TP and selected the certificate to use for authentication

Get error : the connection requires a certificate and no certifcate was found.  - Have checked the certifcate is there.

When using the L2TP and the pre-shared key - all works well.  So I know its a certificate issue.

Anyone came across this before.

Any help... much appreciated.

IM
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Question by:ianmclachlan
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Author Comment

by:ianmclachlan
ID: 36813714
Opp'sss sorry... Think I realise whats I have done wrong..

I use RADIUS for authentication.  I assume thats where I set the EAP(Certifcates) not on the ISA server.

Can anyone confirm this.

IM
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Accepted Solution

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simonlimon earned 500 total points
ID: 36939489
Have you issued an ipsec certificate to both isa and the client. L2tp requores a machine certificate as well?
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