Issues with OneDrive for Business Sync Client caused by update KB5018410 (Oct. 22, 2022)

[German]Microsoft  is currently reporting various issues with the OneDrive for Business Sync Client. These range from problems when logging off, to the synchronization of a Teams website that does not end, to the problem that the OneDrive for Business Sync Client cannot be uninstalled. The whole thing is probably related to the (problematic) Windows security update KB5018410. Microsoft is currently working on a fix.


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German blog reader Andread P. emailed me the following Microsoft status message about these problems as of today, October 22, 2022 (thanks for that).

Incident: OD448875, Affected service: OneDrive for Business,
Affected feature: OneDrive for Business, Current status: Service degradation.

Published Time: 22.10.2022 00:11:37

Title: Some users may intermittently experience various problems with the OneDrive for Business Sync Client
User Impact: Users may intermittently experience various problems with the OneDrive for Business Sync Client.
More info: Users that have updated to Windows Security update KB5018410 may intermittently experience the following OneDrive for Business

Sync Client issues:
-Unable to sign out of OneDrive for Business Sync Client
-Unable to stop syncing a team site via OneDrive for Business Sync Client
-Unable to uninstall OneDrive for Business Sync Client
-OneDrive for Business Sync Client crashes

We recommend that users still update to this latest Windows Security update KB5018410. More details on this update can be found here.

Current status: After receiving reports from users on various issues affecting the OneDrive for Business Sync Client, we identified that a recent Windows Security update, KB5018410, contained a code issue that resulted in impact. We're developing a code fix to address this problem which will then proceed to a testing a validation phase prior to deployment.

Scope of impact: Impact may occur intermittently for OneDrive for Business Sync Client users that have updated to Windows Security update KB5018410.

Start time: Tuesday, October 11, 2022, at 12:00 AM UTC

Root cause: A recent Windows Security update, KB5018410, contained a code issue that resulted in intermittent OneDrive for Business Sync Client issues.

Next update by: Monday, October 24, 2022, at 11:30 PM UTC

Users who have upgraded to Windows security update KB5018410 may temporarily experience the following issues with the OneDrive for Business Sync Client:

  • Unable to log out of OneDrive for Business Sync Client.
  • The synchronization of a team website via OneDrive for Business Sync Client cannot be terminated.
  • OneDrive for Business Sync Client cannot be uninstalled

Cumulative update KB5018410 was addressed by me in the blog post Patchday: Windows 10-Updates (October 11, 2022) and is available for Windows 10 Enterprise/Education 20H2 and Windows 10 21H1 to 21H2. The list of improvements can be found in my blog post Windows 10 20H2-21H2 Preview Update KB5017380 (Sept. 20, 2022).

After receiving reports from users about various issues with the OneDrive for Business sync client, Microsoft has determined that the recently released Windows security update KB5018410 has a code issue that causes the above effects. Microsoft is developing a code fix to address this issue. This fix will go through a testing and validation phase before deployment, Microsoft writes. The next update is scheduled for Monday, Oct. 24, 2022.

Problematic update KB5018410

The security update led to numerous problems with various applications (see for example Citrix connections broken after Windows update KB5018410 (October 2022) (TLS problem)). The reason was a bug in the TLS implementation, which caused SSL and TSL connections to work incorrectly. Microsoft then rolled out an unscheduled update for all affected Windows versions (see my summary SSL/TLS connection issue fix: out-of-band update status and affected applications (Oct. 21, 2022)).


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Similar articles
Patchday: Windows 10-Updates (October 11, 2022)
Out-of-band updates for Windows fixes SSL-/TLS connection issues (also with Citrix) – October 17, 2022
Citrix connections broken after Windows update KB5018410 (October 2022) (TLS problem)
SSL/TLS connection issue fix: out-of-band update status and affected applications (Oct. 21, 2022)


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