Please read carefully as many may people seem to not understand this ---> You need NO PORTS FORWARDED to connect to an irc server.
More likely than not some odd error has occured.
Have you followed these steps they normally cause things to become better.
(1) Restart the pc & router, and try again
(2) windows START > RUN > IPCONFIG /flushdns > OK, and try again
(3) windows START > RUN > CMD > ping irc.serveraddress.net > take IP address and type in mirc /SERVER 1.2.3.4 (the ip address here)
