Have you swapped your CD Keys recently? Higher Ground uses a CD Key authentication system to prevent unauthorized access to your account. If you have swapped to your other set of keys (or are otherwise logging in with the second copy of the game), try swapping back and logging in. You can use your PC Scry to allow your second set of keys to be added to your account.
No, our own system is in place partly because of exactly that reason, though. Go ahead and log in with your previous key you used to get into your playerlist. You can then use your PC Scry to add the other CD Key. The timeout is likely unrelated to any authentication issue and is not something I will likely be able to fix.