Check if your Sons of the Forest server is online
Sons of the Forest runs on Steam networking, so the ports in play are Steam's rather than one obvious game port.
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The ports Sons of the Forest uses
You need the game port and a Steam query port, both UDP, sitting in separate ranges. This tool reads the query port. The dedicated server docs list both, and the usual slip is forwarding just the first.
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Still offline? Try this
Open ports and a failing query usually mean the server is not in dedicated mode or has no valid save selected. A process that could not load its save may sit there running forever and never respond.