Have not checked, but very much possible due to the filtering software they are using. When I try to open a restricted site, the page displayed is of some blocking software (like websense). Means every request is going through that pos blocker.
Bad, too bad.
I am furious, my online gaming experience will be ruined if this is the case. Last time when me and my buddies were playing darkness MP, the game was lagging like hell. Maybe this was the reason.