Malaysian users often have this problem. It's most likely your ISP filtering it out.
As an alternative, try http://qchat.rizon.net, that should at least allow you to connect.
If you prefer to use an actual IRC client instead of sticking with qchat, use qchat and join #rizonbnc and request a bnc there. (our bncs have helped malaysian users in the past, however, it is not guaranteed to fix you problem)