how to connect to Beta TBC server

Hi, i'd like to know how do i connect on the beta server?
plus, is this normal that i can't log in on nostalrius vanilla PVP server, when im trying to log on it disconnects me instantly... (i didn't played since april 2015)
plus, is this normal that i can't log in on nostalrius vanilla PVP server, when im trying to log on it disconnects me instantly... (i didn't played since april 2015)