Check if your Minecraft server is online
When friends can join your Minecraft server but this page reports it offline, the game is nearly always fine. The fault is in the address or the port.
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The ports Minecraft uses
Java Edition runs over ordinary TCP, and the check here sends the same server-list ping your own client uses to fill in the multiplayer screen. Using a domain name? An SRV record can quietly send connections to a port other than the one in the address; we follow SRV records, so type the address exactly the way your players do. Bedrock Edition is another protocol on another port and never answers a Java query.
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Still offline? Try this
Port test passes, status query fails: look for a value in `server-ip` inside server.properties. When it is set, the server binds to that one interface, answers on the machine itself and ignores the outside world. Clear it so the server listens everywhere. Port test fails as well: the block is further out — a firewall rule, or an ISP that has put you behind CGNAT, leaving you with no public address anyone can reach.