Check if your Factorio server is online
Factorio is the exception here: we never contact your server directly. We ask Factorio's own matchmaking service what it knows about it.
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The ports Factorio uses
A Factorio server announces itself to the official public server list, and that entry is what we read. So the outcome depends on visibility settings, not on port forwarding. With `public_visibility` turned off, or without valid Factorio account credentials in its settings, a server is invisible here while running perfectly well and taking direct connections.
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Still offline? Try this
Before touching the router, check the visibility and credentials in server-settings.json. If the server is private on purpose, this check cannot see it and never will — use the port tester to confirm the game port is reachable instead.