Hey folks - so to put it bluntly, the Unity Test Server is having a hard time dealing with the huge stampede of players who are eager to try it out! We knew that everyone was desperate to get a first look at Unity, but this has even surpassed our own expectations.
In the meantime, we're working on the server but it may be better to try the server again in a few hours time once the initial wave of players has receded a bit.
Apologies for the difficulties!