I have an Archer C50 that I use with UPnP on my surveillance cameras.  Each camera uses 3 to 5 ports, depending on model and firmware version.  The last camera I added only added 3 ports out of 5 and the router shows there are 64 ports mapped.  Now I am trying to add another camera and it doesn't seem to connect to UPnP at all - none of the ports get configured.  I can connect to the Internet from the camera for video storage and NTP so I know the camera can talk to the router.

I do find it odd that this problem starts at 64 ports mapped.  It makes me ask this question: is this a spec limit of 64 mapped ports for this router?  Or is something else likely causing it?