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Re:Why TCP Over TCP Is a Bad Idea (2001) by duskwuff on Saturday March 28, 2015 @11:42PM (#9283786)
Probably because they determined that most of it was VPN or other encrypted traffic, and that blocking it was easier than trying to inspect it.
Re:Why TCP Over TCP Is a Bad Idea (2001) by beefsack on Sunday March 29, 2015 @02:02AM (#9284058)
While practically no official information exists publicly, this appears to be the reason. My gut tells me that the lack of structure in UDP makes it a little harder to inspect too.