I have the exact same problem, however with a new install. I recently rebuilt my computer, however instead of installing xchat (xchat.sf.net), a friend of mine urged me to install mIRC. Unfortunately, I have never gotten it to work.

I get the same:
[13:29] * Connecting to Netfire.tx.us.gamesurge.net (6667)
-
[13:30] * Unable to connect to server (Software caused connection abort)
-
[13:30] * Connect retry #1 Kanzi.ca.us.gamesurge.net (6667)
-
[13:30] * Unable to connect to server (Software caused connection abort)
-
[13:30] * Connect retry #2 65.19.161.10 (6667)
-
[13:30] * Unable to connect to server (Software caused connection abort)
-

messages that the parent poster was getting. I am trying to run 6.16 on Windows XP SP2. I have gotten the same error message even after forwarding ports 113, and 6667-7000 on my router, and disabling windows' firewall.

Any help would be greatly appreciated. Thank you!