Thank you very much, but sadly I have not found a solution yet.
I have tried the Web Adaptor inside the domain and it worked. Then, in the DMZ, I tried to psping the 10.10.100.10:6080 and I got 0% loss, but when I psping giserver.domain.com:6080 I get 100% loss. The 6080 port is open, but is there other security configurations I should think about?