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VPN using L2TP getting error 792, for a lab setup

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VPN using L2TP getting error 792, for a lab setup

kaiyne
I've been trying to set up a VPN using L2TP in a lab scenario and can't get past this error 792, The L2TP connection attempt failed because security negotiation timed out. The server is a W2K SP4 and client is XP SP2. There is no domain, just a stand alone.
This is what I've done so far:
-Did a clean install of W2K Adv. Server
-Installed RRAS
-Created a remote access policy to allow all users
-Tested using PPTP from the client and works fine
-Set the server up as a stand alone root CA
-Used the Web Enrollment site to request a certificate using a form - from here I selected Client Authentication Certificate, marked keys as exportable, and checked use local machine store.
-Issued the cert, installed it on the client machine, imported the server's cert into the trusted root CA authorities container and the certs look ok.
-this is done all within a LAN, so nothing is going through a router or NAT server, just through a basic switch.

This is where I'm stumped. I've tried the suggestions from the MS KB - I'm not using a pre-shared key, and I've stopped and restarted the IPsec policy agent and RRAS services and still doesn't work.

Any help out there?
Thanks