I used to be able to run a vanilla minecraft server perfectly, but recently, only I am able to connect, no one else. Nothing has changed, and I have enabled the port through port forwarding the ipv4 address. But for some reason only I can join the server, and yes, I am using the public ip, not the internal ip. However, I ran a port tester website and it said the port was closed.
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if it said the port was closed, when the server was on, the port has not been forwarded (corectly)