Proxy Auth with Active directory trusted domain

[Guest]

[uaccalogo]

I setup an endian server for proxy service with active directory authentication and all works fine.
Now i need to authenticate some user of another Active directory domain correctly trusted with my primary domain.
I try to create a "local group" in my active directory and I put in some user of the trusted domain, i create a rule in Endian that point to this group, but it doesn' work.

Any ideas !??!?

Thanks.
Ennio