I have played a couple of games using the online games options in Watch Dogs, however today whenever I try to join a game I get the error "Unable to connect to public sessions. Please check your NAT type" as follows;
My current network configuration is with me behind a router with UPnP enabled but for diagnostic purposes I have tested this both with my PC in the DMZ with no firewall enabled and using PPPOA with no firewall enabled so this doesn't seem to be an issue on my end.
Since this was working and no settings have changed on my end, what could be the cause of this error? Are there any suggested settings that I should apply to resolve this problem?