My ISP Modem was also a router as well. I had no idea until I read the posts here thank you.
There was no activity on this topic since Nov30th, did the bridge solution fix the issue for everybody or people just gave up? I have this issue too and putting the ISP modem/router in bridge mode didn't fix anything.
You still have to forward the correct ports to you PS4 on your router. So after you change the ISP modem/router to bridge mode, then it will allow the traffic to flow to your router and make the forwards for the proper ports. There is an article somewhere that describes the ports that need to be forwarded for the PS4. There are a ton.
