The game reports a connection timeout or server not found
Check process, primary port, secondary ports and TCP or UDP protocol.
A server may appear started while not listening to the expected port. Some games use a game port, a query port and sometimes RCON.
Step-by-step procedure
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Identify ports
Consult Network and the game documentation to distinguish between main port, query, and RCON.
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Check that the server is listening
Look in the console for the line indicating the address and port actually opened.
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Check protocol
A TCP test does not validate a UDP service. Use the game client or a tool compatible with the protocol.
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Rule out DNS
Temporarily test with the panel IP and port. If it works, fix the DNS or proxy record.