Check if your Counter-Strike 2 server is online
Counter-Strike servers speak the Source query protocol by default, so when a check fails the network is normally to blame rather than your config.
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The ports Counter-Strike 2 uses
Queries share the game port over UDP, so there is no second port to forget — the mistake that trips up most other games does not exist here. Reachable and listed are not the same thing, however: to show in the community browser you also need a valid game server login token linked to your Steam account.
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Still offline? Try this
When the query replies but the server is nowhere in the browser, it is the token you need to look at; ports are fine. When the query gets no reply, check your UDP rule and confirm the map actually loaded.