Unable to forward any new ports
I have a bunch of ports manually forwarded on my router (Superhub 3). Most have these have been set up since I got this router around 2 years ago. I can verify that these ports are indeed open by using any of the tools/sites available that can check for this. They are all open, and the applications that use them work correctly.
I need to open a new port on my router for another application. I can set this up and apply it, and in the router it looks as though it is configured - but the port is not open. I have tried many different ports by way of testing, and none of the newly opened ports are actually open despite showing in the SH3 that they are.
I have also tried enabling UPnP to see if this works. Once enabled, I open the application and check the router - the SH3 shows that the correct ports have been automatically opened via UPnP, but the application fails and checks show that the ports are in fact NOT open.
I have tried:
Restarting the router
Restarting the application
Restarting the PC (no reason why this should have any effect as far as I'm aware)
I am not using a VPN.
Does anyone have any experience of this?