I'm suspicious. I wanted to forward a port (80) on my router and noticed that port forwarding didn't work properly, it didn't work at all.
So I replaced the router and again, port forwarding was not working.
There are no firewalls running and everything is configured as it needs to be, the only thing not working is the port forwarding on the router. I've tested the range from 0-1024 and also tried to forward the port range over 20000, which didn't work.
- Under which circumstances would an ISP level blocking or preventing of port forwarding happen?
- Is it possible that the traffic is routed through some device that would prevent this kind of port forwarding?
- Is this realistic or just a little bit too paranoiac?