iChat will not connect with video or audio on multiple Macs

iChat will not connect for video or audio chat no matter what I do.  This problem seems to be a login trouble of some sort.  The issue happens on multiple computers and always says that I get no response from the other end.  I have tried changing ports, deleting all the plist files and some terminal commands to rebuild different directories.  Anyone have any idea? Oh and I know I should probably be able to figure this out but instead of me spending my time with this issue let me know if you would.

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