Check if your Rust server is online
A working Rust server shows up as offline on trackers so often because the port people join on and the port that answers queries are not the same.
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The ports Rust uses
Server lists, and this tool, read the query port, which has its own number. With only the game port forwarded, everything seems fine — friends connect by IP — but the server never shows in the browser. Rust also has an RCON port. Keep that one closed to the internet; this tool will not test it.
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Still offline? Try this
Add a UDP rule for the query port next to the game port, then test again. If it still fails in the middle of a wipe-day rush, the server may just be too busy to reply before the timeout, since queries sit at the bottom of the queue under load. Wait for the crowd to settle before deciding anything is broken.