How to Fix Arma Reforger “Session Error” – Connection, Mods & NAT
If you’re getting the “Session Error” in Arma Reforger while trying to join or host multiplayer games, it usually points to connection timeouts, broken mods, or restricted NAT types. To start, verify the game servers are active through Bohemia’s official status page. Then restart your router and switch from Wi-Fi to Ethernet for better stability. Set your NAT type to Open by enabling UPnP in your router or manually forwarding the default Arma Reforger ports (UDP 2001–2010). Next, check the Workshop Mods you’re using — mismatched or outdated mods are the number one cause of this issue. Temporarily disable all mods, verify game files in Steam, and attempt to join a vanilla server. If it connects successfully, enable mods one at a time to identify the culprit. On Xbox, ensure your Microsoft account permissions allow multiplayer and that your NAT type is set to “Open” in network settings. You can also clear your DNS cache (ipconfig /flushdns on PC) to prevent lingering IP conflicts.
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