SSTP VPN for client behind MS ForeFront TMG

Hi and thank you!

I've got RRAS SSTP VPN on Win 2008 server. Works ok.

And I've got one client that is sitting on Win7 behind the MS ForeFront TMG.

He could not connect to VPN with error - 0x80072742 (A socket operation encountered a dead network. or something like this - his OS is not in English) What could I recommend to his admin to do with ForeFront to allow him to connect? He tells me that all ports are open - could I check this from a client laptop?

Lina