Try out to open some Ports, i assume that maybe the Ports for the Uplay Launcher are Missing:
Uplay Launcher 80, 443, 13000, 13005, 13200, 14000, 14008
This is more secure than put the PS4 in DMZ, because that means ALLPorts get open.
http://portforward.com/english/appli...rs/Ubisoft.htm