I'm currently using an older pc [upgraded about 2 years ago, that one isn't working] which mirc used to work fine on. Couldn't connect to anything at first, and assumed it was my hall's firewall. I'm at home now, and still can't connect. I've checked our router, and it doesn't seem to be blocking any ports.
I've tried changing the ports, and that changes the error to a timeout. And it's pretty much everything I can think of to connect to irc that won't let me on.