Happy Birthday and @haiz!
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No problem. Out of curiosity, what did you do that fixed the problem? Was it the firewall?
It not showing up in lan game on the same pc the server runs on is normal (see this docs entry).
It sounds like your firewall is blocking it....
Happy Birthday @Ameamefurefure and @El Xando!
You should join using the IP address of the other PC, not using the router's IP.
First you need to get it to work so you can join locally, only...
Happy Birthday @florentynakalmar, @Kekemario and @urszulapajak!
IPv4, Minecraft doesn't support IPv6. What method are you using to obtain the other device's local IP?
You had to choose a device or local ip when configuring the port forward on the router.
(Obviously) it's impossible to two devices to be forwarded to the same port on the same public ip, you either need to remove one of them or choose...
Are you joining from the local or from the public ip? Because obviously you can't port-forward two devices to the same port
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