# Arma 3 Server Won't Start – Mods, BattEye & server.cfg

Arma 3 dedicated server won't start? Mod mismatch, BattEye error, server.cfg, port 2302 – Arma 3 server troubleshooting.

**Quick answer:** Arma 3 won't start: **read RPT log**, **update mods**, check **server.cfg** and open ports **2302–2305 UDP**.

**If you landed here:** Server crashes on start, BattEye/mod errors in logs or restart loop in panel.

## Related

- [Arma 3 won't connect](/en/gameserver/arma3/server-verbindet-nicht)
- [Arma 3 server lagging](/en/gameserver/arma3/server-laggt)
- [Install Arma 3](/en/gameserver/arma3/installation)
*Products & ordering: [Order game server](https://nexorahost.com/category/gameserver-1) · Manage: [panel.nexorahost.de](https://panel.nexorahost.de) · [My account](https://nexorahost.com/account) · [nexorahost.com](https://nexorahost.com) (Frankfurt · 1 Tbit/s DDoS · 99.9% uptime)*