FixAce Combat 8: Wings of Theve
How do you fix error ST-3100001 in Ace Combat 8?
Quick fix
Check your PC clock, sync the time in Windows, then test ACE COMBAT ONLINE again. Bandai Namco's Steam notice of 30 September 2026 gives these steps and says ST-3100001 appears when the game loses communication with its server. One Steam player says correcting a clock about 136 seconds behind cleared the error; that is a single report.
Why it happens
Bandai Namco posted a Steam notice titled “About Error Code: ST-3100001” on 30 September 2026. It says the error shows up while you play ACE COMBAT ONLINE and stops you from carrying on. According to the notice, you see the code when the game’s communication with its server drops.
On the Steam forum, a player posting on 23 October 2026 says they get “ST-3100001 (Connection Lost)” when they start an ACE COMBAT ONLINE mission.
Fixes
Fix 1: Sync your Windows clock, then test again (PC, Steam)
Bandai Namco’s notice gives three steps:
- Check your PC’s clock for a time discrepancy.
- Synchronize the time in Windows.
- Test the game again.
The notice was posted on Steam, and its steps are for the Windows clock on a PC.
One player on the Steam forum reports that their PC clock was about 136 seconds behind. They say that after they corrected it, the match loaded and the error no longer appeared. That is one player’s result, so treat the clock fix as Bandai Namco’s suggested step rather than a sure cure.
If nothing works
Player reports differ: a Steam forum poster wrote on 23 October 2026 that they had already tried many things and none of them solved ST-3100001.
For online play in general, Bandai Namco’s notice of 9 October 2026 says matchmaking may be harder to establish from environments that don’t meet the game’s system requirements. The same notice says the game is officially supported on Windows 11. Neither point is one of the steps in the ST-3100001 notice.
Related questions
What does ST-3100001 (Connection Lost) mean in Ace Combat 8?
Bandai Namco's notice says the code shows up when ACE COMBAT ONLINE loses communication with the game server. A Steam player who posted on 23 October 2026 quotes the message as ST-3100001 (Connection Lost).
Why do I get kicked with ST-3100001 when I start an online mission?
Bandai Namco ties the error to lost communication with the game server, and its suggested fix is to sync your Windows clock and test again. One Steam player says their match loaded without the error after they corrected a clock that was about 136 seconds behind.
Does syncing the Windows clock always fix ST-3100001?
It isn't guaranteed: Bandai Namco's notice asks you to try it, and one Steam player says it cleared the error for them, but one player's result doesn't prove it works on every PC.
Sources
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