Yes, this is what I mean. Server does not necessarily reject the connection, btw.
Well by default, theses are the arguments you have to work with:
function GameConnection::onConnectRequest(%client, %ip, %lan_name, %net, %clan_prefix, %clan_suffix, %password)
I am pretty darn sure the server will reject the connection in any except the most extreme cases, but if not you are probably out of luck.