In mIRC - go to File/Options, then to Connect, then to Local Info
Copy everything there to here - which boxes are checked and which button is clicked - DON'T paste yuour IP address or local host here if you value your privacy, but make sure they look like real ones.
BTW, the end of local host - the <whatever>.net or .org or .com should be your provider - that you can post here.
okay, that's what's wrong - the ip address has to get filled in ... try changing the Server method to Normal, click ok, close mIRC and rerun it. (You have to close it because it only gets the local stuff when it first starts up.)