Can't host game : PC not reachable?

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Re: Can't host game : PC not reachable?

windows 10
I opened the udp port 4321 on router and test program says it is opened
but from web check sites it says not open... seems a bug of windows 10...
the game also advice i am not reachable
other people see me on server hosting the game but with infinite simble on ping coulumn
I see also a lot of people with the same problem trying to host games online also with ITST mod installed

Anyone can help me and i think many other people?

Thank you in advance...