@mweber As said the UPnP was always switched off. I have now unplugged the Archer, and after a wait, plugged it back in, now can I enter the port forwarding to UDP 4500, strange... Thanks very much

I want to set a port forwarding on a specific machine and I can't set it. Think the Archer C80 has occupied the port internally.

@mweber When I check the port from external, it shows as Open.

@terziyski I also disabled UPnP at the beginning, so unfortunately that's not the cause.

Hello, I cannot set port forwarding for port 4500 UDP on the Archer C80. A message appears that the port is already occupied. When I check the port, it also says it's open. But there is no set port...