YAWCAM OVER ISA SERVER OR FOREFRONT TMG

[xames]

I have Forefront TMG firewall behind my ADSL Router and I can open the ports over router to point the final client machine with correct port but with finally i recieve the same error 0x8007274c WSAETIMEDOUT.

Isn't possible to view the streaming video over firewall like Forefront?

Thanks.

[xames]

nobody?