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Find information on known issues and the servicing status for Windows 10 Enterprise LTSC 2021 and Windows 10 IoT Enterprise LTSC 2021. For immediate help with Windows update issues, click here if you are using a Windows device to open the Get Help app or go to support.microsoft.com. Follow @WindowsUpdate on X for Windows release health updates. If you are an IT administrator and want to programmatically get information from this page, use the Windows Updates API in Microsoft Graph.
Current status as of May 2, 2025
Windows 10 Enterprise LTSC 2021 and Windows 10 IoT Enterprise LTSC 2021 will have mainstream support until January 12, 2027.
Windows 10, version 21H2 Home and Pro editions reached end of servicing on June 13, 2023. Education and Enterprise editions reached end of servicing on June 11, 2024. Devices running these editions do not receive security updates containing protections from the latest security threats.
As always, we recommend that you upgrade eligible devices to Windows 11. For information about servicing timelines and lifecycle, see Windows 11 release information, Windows 10 release information, Windows Lifecycle FAQ, and Microsoft Lifecycle Policy search tool.
Known issues
See open issues, content updated in the last 30 days, and information on safeguard holds. To find a specific issue, use the search function on your browser (CTRL + F for Microsoft Edge).
| Summary | Originating update | Status | Last updated |
|---|---|---|---|
| Problems with NDI streaming performance after installing the August 2025 update Severe stuttering, lag, and choppy audio/video are reported on streaming apps, such as OBS and NDI Tools. | OS Build 19044.6216 KB5063709 2025-08-12 | Confirmed | 2025-08-21 16:42 PT |
| Enterprise customers might be unable to use Microsoft Connected Cache This issue affects Windows devices which use the DHCP Option 235 to configure the Microsoft Connected Cache endpoint | OS Build 19044.4046 KB5034763 2024-02-13 | Mitigated | 2024-04-05 11:43 PT |
Issue details
August 2025
Problems with NDI streaming performance after installing the August 2025 update
| Status | Originating update | History |
|---|---|---|
| Confirmed | OS Build 19044.6216 KB5063709 2025-08-12 | Last updated: 2025-08-21, 16:42 PT Opened: 2025-08-21, 16:25 PT |
Severe stuttering, lag, and choppy audio/video might occur when using NDI (Network Device Interface) for streaming or transferring audio/video feeds between PCs after installing the August 2025 Windows security update (KB5063709). The issue affects streaming apps, including OBS (Open Broadcast Software) and NDI Tools, especially when "Display Capture" is enabled on the source PC. The problem persists even under low bandwidth conditions.
Workaround: To work around the issue, NDI recommends manually changing the NDI Receive Mode to use TCP or UDP instead of RUDP. For steps to do this, see the NDI support site: Traffic Drops After Windows Update.
Next steps: We are investigating this issue and will provide more information when it is available.
Affected platforms:
- Client: Windows 11, version 24H2; Windows 10, version 22H2; Windows 10, version 21H2
- Server: None
April 2024
Enterprise customers might be unable to use Microsoft Connected Cache
| Status | Originating update | History |
|---|---|---|
| Mitigated | OS Build 19044.4046 KB5034763 2024-02-13 | Last updated: 2024-04-05, 11:43 PT Opened: 2024-04-05, 11:09 PT |
After installing the February 2024 Windows security update (KB5034763), released February 13, 2024, or later updates, some Windows devices which use the DHCP Option 235 for discovery of Microsoft Connected Cache (MCC) nodes in their network might be unable to use the MCC nodes. Instead, these Windows devices will download updates and apps from the public internet and IT administrators would see increased download traffic on their internet routes.
Home users of Windows are unlikely to experience this issue, as Microsoft Connected Cache configured via DHCP Option 235 is more commonly used in enterprise environments.
Workaround:
- Option1: Configure Microsoft Connected Cache endpoint in DOCacheHost policy as indicated in Cache hostname. Additionally, DOCacheHostSource has to be set to 1 or removed as indicated in Cache hostname source. Note that by default, the DOCacheHost and DOCacheHostSource policies have no value.
- Option2: This issue can also be mitigated using Group Policies available through our support channel. Organizations can request help through Support for business.
Next steps: We are working on a resolution and will provide an update in an upcoming release.
Affected platforms:
- Client: Windows 10, version 21H2, Windows 10, version 22H2
- Server: None
Report a problem with Windows updates
To report an issue to Microsoft at any time, use the Feedback Hub app. To learn more, see Send feedback to Microsoft with the Feedback Hub app.
Need help with Windows updates?
Search, browse, or ask a question on the Microsoft Support Community. If you are an IT pro supporting an organization, visit Windows release health on the Microsoft 365 admin center for additional details.
For direct help with your home PC, use the Get Help app in Windows or contact Microsoft Support. Organizations can request immediate support through Support for business.
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