Some ISPs are running out of IPv4 addresses, so are doing NAT upstream, creating a defacto double NAT scenario when it reaches you. That can kill your port forwarding.
) that you are using a DDNS service to test your port forwarding. In which case it will not work correctly.The solution would appear to be to contact your ISP and get them to give you a fixed IP.
Yes, it wouldn't. I thought more about it and my edit and your post crossed paths.
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