# After Windows Update Management Server service will not start or Login to the Clients will no longer work - EN

**URL:** <https://community.mobotix.com/t/after-windows-update-management-server-service-will-not-start-or-login-to-the-clients-will-no-longer-work-en/10003>\
**Category:** FAQ\
**Tags:** troubleshooting, login\
**Created:** [October 16, 2025, 6:21am UTC](https://community.mobotix.com/t/after-windows-update-management-server-service-will-not-start-or-login-to-the-clients-will-no-longer-work-en/10003 "2025-10-16T06:21:35Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Mx-JoergS](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.mobotix.com/mx-joergs/32/10425_2.png) [@Mx-JoergS](https://community.mobotix.com/u/Mx-JoergS)\
**Post date:** [October 16, 2025, 6:21am UTC](https://community.mobotix.com/t/after-windows-update-management-server-service-will-not-start-or-login-to-the-clients-will-no-longer-work-en/10003/1 "2025-10-16T06:21:36Z")

</div>

MOBOTIX has discovered a compatibility issue where recent Microsoft Windows Up-dates may break communication between the MOBOTIX HUB Management Server service and Microsoft Internet Information Services (IIS), a required dependency. This can result in MOBOTIX HUB VMS becoming non-functional.

**Symptoms:**

After installation of Microsoft Windows Updates KB5066835 and KB5065789, the following behavior was be noticed in some installations:

- MOBOTIX HUB Management Server service will not start
- Inability to login to MOBOTIX HUB Management Client or MOBOTIX HUB Desk Client

Current information about the Windows patch error and the fix for the MOBOTIX HUB VMS can be found here:

> [@Windows updates KB5066131, KB5066835 and KB5065789, are breaking the Management Server functionality (troubleshooting) - EN](https://community.mobotix.com/t/windows-updates-kb5066131-kb5066835-and-kb5065789-are-breaking-the-management-server-functionality-troubleshooting-en/10014):
>
> Windows updates KB5066131, KB5066835 and KB5065789, are breaking the Management Server functionality (troubleshooting) The latest Windows updates (KB5066131, KB5066835, and KB5065789) are breaking the communication between the MOBOTIX HUB Management Server and IIS (Windows web server); as well as on standalone Recording Servers. There are some workarounds available. Issue The latest Windows updates — KB5066131, KB5066835, and KB5065789 — are breaking the communication between the MOBOTIX HUB Ma…

**Root Cause:**

Our development team has identified the cause as an error in Microsoft’s implementation of the HTTP/2 protocol. To resolve the issue, customers can do the following:

- **Uninstall the following Windows updates:**
  - KB5066835
  - KB5066131
  - KB5064401
  - KB5065789

- **Restart the operating system** after uninstalling the software.

If you have any further questions about this issue, please contact MOBOTIX Technical Support: [support@mobotix.com](mailto:support@mobotix.com)

**Related articles** (These articles are hosted by 3rd parties and MOBOTIX is not responsible for their contents):

> **[KB5066835 update causing IIS Service to not work - Microsoft Q&A](https://learn.microsoft.com/en-us/answers/questions/5585440/kb5066835-update-causing-iis-service-to-not-work)**
>
> Recently my local hosted IIS services is not running after the new update. My visual studio projects also can't be run as well. I have to delete the new update in order to run my projects and local hosted services again. May I know what is the...

[Https://stackoverflow.com/questions/79790827/localhost-applications-failing-after-installing-2025-10-cumulative-update-for-w](Https://stackoverflow.com/questions/79790827/localhost-applications-failing-after-installing-2025-10-cumulative-update-for-w)