We have got a Server 2003 DC that was able to connect via VPN (PPTP and L2TP) and this crashed and had to be rebuilt completely. We now can't connect in through L2TP as this errors with
Error 789: The L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer
I have tried to set this to a pre-shared key to see if this would help but still get the same error. There is no NAT on the server also.
When the server was rebuilt it was renamed to the original server name but the 'Full computer name' wasn't and so is the default name that Windows install chooses (sort of svctag-456432 etc). Could this be the issue in case do i need to rename the DC properly ?