Check if your Abiotic Factor server is online
Abiotic Factor answers the standard Steam query on its query port, which is the port this check needs — not the game port players use.
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The ports Abiotic Factor uses
The checker is filled in with 27015, the default query port. If you started the server with a different -QueryPort=, enter that. Entering the game port (7777) will not get an answer.
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Still offline? Try this
If the query port is open and there is still no reply, check that the server finished loading its world, and that it was started with the query port you expect — launch arguments are the only place it is set.