I'm having an issue similar to this. I just downloaded mIRC but I've been using other IRC clients for a while and they've worked fine. I just haven't liked them. I entered all the information correctly and I lowered my firewalls. It still won't connect. I've tried the IP, I've tried other servers, nothing is connecting. I can get on chatzilla, but not mIRC. Nobody has been able to help me figure it out. I'm going nuts.