I've tested Dead Zone, it appears to be working fine for me. It sounds like a firewall issue though, or a privacy settings issue. What could be different on your end from yesterday to today?
i do nothing at home (breakfast and sleep untill now) and now game works perfectly O.o
on "the last stand dead zone" support forum few other people have same problem or similar (problem with connection not only via AG, trough facebook or others sites too) so probably this is/was game problem.