I'd been made an underground research how to bypassing all of this (since I was the victims in my network too). All you have to do is preparing the Linux box and create it as the local web server connected to the active network (direct connection without proxy). There is no special requirement about what kind of Linux you may use. I am currently using Fedora Core 4 by now with the latest kernel version of 2.6.17.
Meanwhile, for the lacks of chat connections via IRC, you may need Gaim application package. Make an usual process to connect as mIRC did, and yes! You're online to the channel you'd like to enter.
For others instant messages, try to use IM application package. By default, the jabber protocol which compatible to Google Talk using different port with Yahoo IM. So, it is become not a matter anymore to having private chat within jabber compatible protocol such as ICQ or Google Talk.
May this tricks beneficial for you. Do it by your own research.
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