I gave up on the 5.1.2 installation.
We had numerous problems, printers that were unavailable, we couldnt ping from outside through the VPN to boxes on the inside, You would get disconnected from the vpn randomly, I could remote control my desktop XP box then disconnect and it would not re connect. Trying to connect with putty from an internal box would result in a wait of 60-90 seconds to get the password prompt after entering the logon name, 98se or XP would take 1-2 mins to run the login script and there was a wait of 1-2 mins to open a folder and then sometimes you would be able to browse immediatly and other yet another wait.
I grabbed a new hard disk and installed 5.0 updated it with the blades (I must say the 5.12 blades interface is much better) and restored the data and its running the way it should.
I'll wait till I see more reports of success before I try again, I have wasted over a week and suffered a lot of frustration and down time.
After happily running a 4.12 server with next to no problems for 12 months I was very disapointed.
Jon