I am new to mIRC, but I had it installed and was using a server for a forum I go to. Well, my ISP installed a new router and since then I can not connect properly for more than a few seconds to the server.

I connect to the server, get the welcome message, then join the channel and I get this error message:

Unknown/Unsupported Command: N #general


(#general is the channel name)
Does anybody know how to fix this?