If you’re in Malaysia, on Unifi, and find that you can’t use clients like X-chat, mIRC, or even Chatzilla, give this solution a try:
/server irc.nameofserver.domain [number]
Which would look something like
/server irc.beyondirc.net 5531
If it works, then it would be safe to say that port 6667 has been blocked. I say this because I know that I’m not the only person who has found that port to be blocked when trying to connect to an IRC network. Interestingly, accessing IRC via web browser works, just not the standalone clients, which led me to believe that the IRC port was blocked (6667 is the most popular port, after all).
Please let me know in the comments if this works for you.
Note to self: Unifi’s tech support hotline is 1-300-88-1221 The frontliners do not know what IRC is. I feel old.