Your routers UPnP is bad and doesn't function correctly (try port forwarding).You forwarded the wrong protocol for the port(s).ISP router has built in port blocking that will make the ports unavailable.ISP blocking ports CG-NAT (Carrier Grade NAT).In my case due to my old router, whenever i port forwarded from my routers settings 'website' it never opened the ports so the Manual UPnP method i showed you worked for me 1st try.In case it did NOT workPossible reasons for failing to port forward: (same screenshot, ignore IPv4 number being the same) Use cmd ipconfig to see if your IPv4 matches your setting.Click ok WARNING: If you typed something incorrectly you will lose your connection, revert changes to Obtain IP address automatically and Obtain DNS server address automatically to restore your connection.If your default gateway address is 192.168.2.1 your IPv4 has to be 192.168. x x being from 2 to 255, i recommend something like 232. Fill out the spaces with the info you obtained from cmd with the exception of IPv4, You can change the last number only so if default gateway is 192.168.1.1 you can change it to 192.168.1.Right click your connection method (wifi/ethernet) and click properties.Copy/write down IPv4, Default Gateway, Subnet, DNS Server(s).Your INTERNAL IP won't change for your device anymore On the main menu select clients, select your device.

Some routers don't require a static ip to forward since they are smart enough to identify your device and lists it in a drop down menu (dhcp), however I'm including 2 methods just in case.

How to change nat type to open pc bo3