Thanks BenFB

you got it right !!!!

I'm looking for using UAG (into dmz) and i followed this link   "https://www.carlstalhood.com/vmware-unified-access-gateway/"
I have read that I must disable all the "internal" gateways to the connection servers (are in my Lan) . I followed the mapping of the ports for UAG 443-8443-4172 for the UAG server, but unfortunately I always get black screen. As connetion server inside uag I entered https: //contoso.local and as Blast External URL I entered https://contoso.com:443, but unfortunately I always get black screen.

I state that inside I have everything in client tunnel connection and everything works well

can ypu help me for search problem

Thanks Alessandro