TMG: SSL traffic fails. Destination: External (255.255.255.255:8080)

Hi,

We are in the process of configuring TMG 2010. From a web client, all is good as far as HTTP traffic goes. We get the page returned without issue. The problem occurres when we try and browse to SSL (443) pages.

In the logs, we see the line:

Destination: External (255.255.255.255:8080)

But what we don't understand is where is this "255.255.255.255" address coming from. On are current ISA 2006 server, we see Destination: External (173.194.41.96:443).

On our external firewall, sitting between the TMG server and the big bad world, we don't see anything coming from TMG.

I'm sure it is something really simple, but we just can't figure it out.

Below is a screen shot of the issue.

Any help would be greatly apreciated.

Thanks

W.

W.