He most likely did do something with a firewall. My school had always had one, but I could still get on mirc no problem (it doesn't interfere with file sharing). The thing I remember him doing was disabling msn, which I attempted to reenable so I could send files through AIM. Maybe he did something else or I didn't fully reenable it though. Anyway, this is the message I got when I tried to connect to those two servers:
* Connecting to 66.250.51.200 (6667)
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* Unable to connect to server (Connection timed out)
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* Connect retry #1 66.250.51.200 (6667)
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* Unable to connect to server (Connection timed out)
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* Connect retry #2 66.250.51.200 (6667)
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* Unable to connect to server (Connection timed out)
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* Connect retry #3 66.250.51.200 (6667)
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* Unable to connect to server (Connection timed out)
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* Cancelled connect
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* Connecting to acool.dal.net (6667)
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* Unable to connect to server (Connection timed out)
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* Connect retry #1 acool.dal.net (6667)
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* Unable to connect to server (Connection timed out)
I know it isn't a problem with my connection, because I tried to make this connection in a new window while still connected to mircx (in the past I have tried to get on a server other than mircx while not connected to any other server and got the same results).