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ACE COMBAT 8

Windows Time Sync Fails: Checks Before Retrying ST-3100001

Use this when Windows 11 time synchronization itself fails while checking ST-3100001. If synchronization succeeded but the game still disconnects, use the connection guide instead.

Edited by Gemnao Editorial Team (Japanese)Last checked 2026-10-13
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The short answer

Check the sync error and last successful time first. On a PC you manage, read w32tm status and source before requesting another sync. A stopped service or a successful offset measurement alone cannot identify the cause or prove synchronization. Move to connection checks once time sync succeeds.

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Key facts

Record first
Attempt time, exact error, last successful sync and whether the PC is managed
Read-only checks
w32tm /query /status → w32tm /query /source
Stopped does not prove failure
Manual/Stopped can be normal trigger-start behavior on a workgroup PC

Find your symptom

Start with your symptom. Skip steps that do not apply to your setup.

What you seeWhat to checkGo to
Settings are disabled or managed by an organizationAsk the administrator without changing policyStep 1
Sync fails or its last success is unclearRead the error and time sourceStep 2
Your personal PC still needs a syncRequest one sync and verify its timeStep 3
Time sync succeeded; only the game disconnectsCompare connections instead of repeating clock changesStep 4

Fixes, in order

Continue this issue

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Step 1｜Check the sync screen and who manages the PC

Separate the displayed clock from the result of synchronization.

Time: About 2 minutes · Risk: low

  1. Open Settings → Time & language → Date & time. Record automatic-time settings, the correct local time zone, the last sync shown and any error.
  2. For a work or school PC, leave managed settings unchanged and give the administrator the error and attempt time. On your own PC, try Sync now once and record its result.
  3. If you changed the time zone by mistake, restore your actual region. Do not offset the clock manually to get into the game.

Step 2｜Read the sync status and time source

These queries inspect settings; they do not replace them.

Time: About 3 minutes · Risk: low

  1. On a PC you manage, open Command Prompt as administrator. Run w32tm /query /status and w32tm /query /source separately.
  2. Record Last Successful Sync Time, Source and any actual error. Mark failed queries as unverified; an old timestamp is not proof that this attempt succeeded.
  3. Manual/Stopped for W32Time alone does not mean it is broken. If a domain source appears, consult its administrator rather than switching to a public server.

Read-only queries need no rollback. Remove computer and organization names before posting output publicly.

Step 3｜Request a sync only when needed, then verify its time

An additional check for a personal PC that still needs synchronization.

Time: About 3 minutes · Risk: low

  1. Save your work, then run w32tm /resync once in an administrator Command Prompt. If it reports an access, service or time-data error, keep the full message and stop changing settings.
  2. After a completion message, run w32tm /query /status and check that Last Successful Sync Time matches this attempt. Restart Steam and the game after confirming success.
  3. stripchart measures an offset. It uses a different source port from the W32Time client, so a successful measurement does not prove a successful clock sync.

Keep the corrected automatic time. Do not restore an inaccurate clock, re-register the service, edit the registry or disable the firewall.

Step 4｜Separate Windows sync failure from a game disconnection

Choose the next check before repeating the same operation.

Time: About 3 minutes · Risk: low

  1. If sync still fails, give the PC maker or administrator your Windows version, error, available status/source information and last successful sync time.
  2. If sync succeeds but the game disconnects, record whether it happens in the lobby, at match start, during play or on the results screen, then continue to connection checks.
  3. Do not force a new time source or copy Windows Server registry procedures onto a home PC. Ask the administrator whether any network change is necessary.

Connection checks after successful time sync — Continue here once Windows synchronization works.

Avoid

  • Do not change startup policy based only on a stopped service
  • Do not deliberately offset the clock for a game
  • Do not batch registry, service-registration or security changes

Important cautions

  • Successful time sync does not guarantee that ST-3100001 is fixed or that the game service is healthy.
  • On managed PCs, follow the organization’s time policy and ask its administrator to handle restricted actions.

FAQ

Does a stopped Windows Time service explain the failure?

Not by itself. A workgroup PC can stop the service as part of its default trigger-start behavior. Check the actual sync result and last successful time.

Does a near-zero stripchart result prove synchronization?

It shows a small measured difference from that source at that moment, not that the Windows sync operation succeeded. Check status and the last successful sync separately.

Sources

We checked these official pages and wrote the steps in our own words. Follow the publisher’s page if it has changed.

Microsoft Learn: Windows Time tools and settings, including Windows 11Microsoft Learn: W32Time trigger-start behavior on workgroup PCsACE COMBAT 8 (Japanese)Japanese version of this page