YouTube Problems behind TMG Firewall

Question

Hi Geniuses,
Problem we're having. We're a Government Entity that has its full connection traffic routed to us through another parent hierarchial department.
We run a Microsoft Threat Management Gateway 2010 (ISA Server) Firewall locally that filters our traffic quite well.
If we play YouTube videos via IE/Firefox/Chrome/Safari on local AD authenticated user accounts on Desktops we don't have an issue.
We connect our iPad/iPhone devices to the WiFi however and most services work - Except YouTube. And thats both the YouTube App, and the m.youtube.com URL within Safari. Whilst we can use both to search, and bring up previews of the videos, when you go to click on the Video's they just will not play or load and gives the error 'the operation could not be completed'.
From what we can see on the TMG Logs, the requests going out to YouTube are all Port 80 Traffic, but it fails in the connection somehow.
Does anyone know specifically the handshake/authentication process with the YouTube App? What ports it initialises, whats contained in the headers etc.?
Cheers!
hamgatan

Answer 1

I had this issue and solved it. The reason for a lot off these issues is that Apple hates Adobe flash which is the method most site use to stream movies instead apple uses multithread http . Many virus scanners turn off HTTP resume because it makes it impossible for virus scanners to scan http content.
If you are using an internet service with virus scanning as a part of the service package or using wireless where a firewall is in use this is more than likely the problem.
Solution :  Just add a Destination Exceptions in Malware Inspection , and just it problem solved
Message was edited by: Ghazi786