When starting Protect, I am notified that I have renamed the computer (I haven't but I did migrate the database from another machine). After clicking OK, Protect loads but the I get a message that the console service is not running. Checking Services reveals that it has crashed and it cannot be restarted until Protect is closed.
I believe the easiest way to get your database associated with the Protect server again is to uninstall and re-install Protect. It should only take a few minutes and you won't lose any data in the process.