Only in this situation will this occur. I connect to a japanese network irc.2ch.net through a BNC server running znc. The channel windows already joined will show up after connecting. any attempt to join a channel mIRC will part the channel immediately. and messages from the channels are received as PM. I have run a debug window to compare messages with undernet and found no difference. I have also seen no difference in server messages saying I joined a channel, except mIRC send a request to part the channel right away. I have tested irssi on linux and found it to work with no problems. I have also upgraded znc and upgraded mIRC which has not solved the problem. znc will work with other servers through mIRC except this one. seeing as there's no difference from server messages I'm confused as to why mIRC responds this way, but I decided to submit it as a bug.