Then you are gonna be SOL, unless you are willing to try and hack your way through the firewall.
This is not an IRC issue, it is a port and firewall issue. And there is no simple answer, since every network and firewall is set up differently. There are hundreds of ways they could have done it, and hundreds of ways to work around it, depending on how it was done in the first place.
They may have redirected the ports to some obscure port, or they may have totally blocked it and all IRC traffic from their network. Without either hacking or inside information (or assistance), you will not be able to fix it.
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