I played Until Uru all day and it was working fine, except for shutting down when I linked to Relto from D'ni, but I think that was my computer. But I tried to play again, and it loads everything fine until it say "Preparing to Link- Authenticating". Then it waits for a long time and comes up with and error saying "Auth Response Failed", and it shuts down.

It's possible that the authentication server went down. Its usually not a permanent thing, but since it isn't a fully-fledged and officially-run MMO again yet, downtime is probably going to be a bit more substantial. Try again later is the only advice I can give you.

Yup, you'll see that on occasion, when the authentication server gets overloaded or goes down.

I got that this morning. It wasn't a problem, I just tried again and it worked.