About Error Code: ST-3100001

30 Sep 2026Developer post

We have received reports that error code 'ST-3100001' appears while playing ACE COMBAT ONLINE, preventing players from continuing the game.

This error code appears when communication with the game server is lost.

Please check the following settings:

・ Synchronizing the time on Windows.

Please check to see if there is a time discrepancy, synchronize the time on Windows, and then test the game again.

We apologize for the inconvenience and appreciate your cooperation.

The ACE COMBAT Team

Build and release context

Recorded Steam release date: Oct 1, 2026

Within one calendar day of this post (UTC). The listed date does not establish an exact launch time.