Richterm's Retreat Nordock

I am able to log into the "classic" server but not sure what the difference is and would rather log in the other.

I already got the new CDKEYS

I have tried more than once to play on richterms land of retreat nordock and cannot seem to play. I make a character and once i do instead of going to a load screen it exits and tells me i have been booted, I have never played here before but would like to, how do i fix this?