said by johnpsph :

I recently set up a VPN server on a 2k3 machine, and it worked flawlessly when I had the client select "Type of VPN: Automatic". However, when I manually changed the type to L2TP over IPsec, entered a PSK (This is using the built in Vista VPN CLient), then in the Routing and Remote Access configuation, I right click my server name, go to properties, then the security tab, and check "Allow custom IPsec policy for L2TP connections" and enter the same PSK, attempting to connect to the server generates the following client error: "Error 732: Your computer and the remote computer could not agree on PPP control protocols."

One the server in Event Viewer I get: "Unable to add the interface {FE282F3E-B086-43D9-8AD5-AFC281B11CB0} with the Router Manager for the IP protocol. The following error occurred: Cannot complete this function."

Any suggestions as to what I can do to solve this would be greatly appreciated. Thanks

Sorry to cross-post, but I also posted about this in the MS forum, but wasn't able to get a solution. However, I put up a bunch of screenshots here:

»[2K3] Cannot connect to VPN via L2TP over IPsec: "could not