Which ports for Arma 3 server?

2302 UDP (game), 2303 UDP (Steam query). Optional 2304–2306 for more slots. Open all.

Arma 3 "File patching rejected"?

Mod versions don't match. Steam Workshop mods in exact same order on server and client.

Keep BattlEye updated on client. Server.cfg: BattlEye enabled. VPN/overlay can cause issues.

Quick answer: Arma 3 connection issues: port 2302 UDP, matching Workshop mod list and BattlEye active.

If you landed here: Arma 3 shows "Connection failed", mod errors or BattlEye kick on join.

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