Conan Exiles server status checker
Conan Exiles has a separate query port, and it is not adjacent to the game port — it is in an entirely different range.
Which ports a Conan Exiles server needs
Players connect on one UDP port; queries are answered on a Steam query port in the 27000s. Because the two numbers look unrelated, people routinely forward the game port and assume they are done, which produces a server that friends can join by IP but that never appears in any list.
If it still shows offline
Forward both, as UDP. If the query still times out, check whether BattlEye is enabled and finished initialising — the server does not answer during that window, and on a large map it is not brief.