This message is explained
here:
TOO MANY CONNECTIONS FROM YOUR HOSTNAMEClosing Link (No more connections)
Closing Link (You are only allowed one connection from your host.)
This means you already have one or more connections to the IRC server and you are not allowed more then the current amount of connections from your address or PC. Normally two connections to the same IRC server are allowed. Check and see if you already have a copy of mIRC running with a connection to this server! Also if you are connecting from behind a firewall or proxy (like Internet Connection Sharing) and thus sharing one IP Number(!), the server will see you all as coming from one address! It will refuse access if more people from your place are on this IRC server already, using the same proxy, or if you have more IRC clients running.
Regards,