i was not able to sign up or free hosting (without posts) and the error says that:

The value specified for the Forum username field is not valid.
Forum username must be between 4 and 8 characters in length, and contain only the characters abcdefghijklmnopqrstuvwxyz0123456789.
Your post count could not be validated for the following reason: RPC protocol error: HTTP 500: Internal Server Error

my username and password are both 8 characters long and are only alphanumeric so I think it is the RPC protocol error

sorry
we test it
we have move to new servers