# Satisfactory Server Troubleshooting (/docs/satisfactory/fix-issues)



import { Step, Steps } from 'fumadocs-ui/components/steps';

"Invalid Authentication Token" / "Encryption Token Missing" [#invalid-authentication-token--encryption-token-missing]

**Cause:** Players used "Join Game" instead of Server Manager.

**Fix:** Connect via **Server Manager** from the main menu, NOT "Join Game."

"Certificate Verify Failed" [#certificate-verify-failed]

**Cause:** System clock mismatch between client and server.

**Fix:** Ensure both systems have correct date/time/timezone. If persistent, delete `ServerSettings.7777.sav` and restart.

Players Timing Out [#players-timing-out]

Increase timeouts in `Engine.ini`:

```ini
[/Script/OnlineSubsystemUtils.IpNetDriver]
InitialConnectTimeout=60.0
ConnectionTimeout=60.0
```

EOS/NAT Warnings [#eosnat-warnings]

`LogEOSP2P: NAT Detection Failed` and `LogEOSAnalytics` warnings are **harmless** — ignore them.

Ports Showing as Closed [#ports-showing-as-closed]

The server process must be running for ports to show open. Verify with:

```
nmap -sT -sU <ip> -p 7777
```

Train Issues [#train-issues]

If trains stop loading/unloading, load the save in single-player, rebuild Train Stations, save, then upload back.

Performance [#performance]

* Single-thread CPU performance is the bottleneck
* Large factories with trains are heaviest
* 8GB RAM minimum, 16GB recommended for complex saves
* Default 4 players — increasing impacts performance

Related Guides [#related-guides]

* [Server Configuration](/docs/satisfactory/server-config)
* [How to Join](/docs/satisfactory/join-server)