I've install ADFSv2 Server on my internal network and establish a trust relations between the INTERNAL Domain Controller (IDC) and an EXTERNAL Domain Controller (EDC).
I was able to access from an external client and also internal client to the inner portal.
I tried to add another layer on the ADFS Server and installed ADFS Proxy in my internal network.
using the guides - "AD FS Proxy Step by Step Install Guide" and from "ADFS v2 Proxy Issue" Adam Conkle answer.
Now I am having problems :
with the internal client everything is working fine BUT I can't access from an external client to the inner portal.
I am getting "Certificate Error: Navigation Blocked"
"There is a problem with this website's security certificate."
.....
and so on.
currently all is in a lab environment and not the real world.
So maybe I forgot something, I did not touched the hosts file of the external client and not the External Domain Controller.
The configuration of thos 2 machine is the same as it was for the ADFS v2 Server and with that scenrio I have no problem.
Thanks