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Find information on known issues and the servicing status for Windows Server 2012 R2. 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 September 14, 2026
On October 13, 2026, Extended Security Updates (ESU) for Windows Server 2012 R2 will end. After this date, devices running this version will no longer receive security updates containing protections from the latest security threats.
Windows Server 2025 is now the latest Long-Term Servicing Channel (LTSC) release for Windows Server. To help keep your environment protected and supported, plan to upgrade to Windows Server 2025 for full mainstream support. To download a free 180-day evaluation, visit the Microsoft Evaluation Center. Evaluate upgrade options and begin deployment testing early to help ensure a smooth transition.
For detailed lifecycle dates, see the Windows Server 2012 R2 lifecycle page. For servicing timelines and related resources, see Windows Server release information, Lifecycle FAQ - Windows Server, and Microsoft Lifecycle Policy search tool.
Note: This page will be retired on November 13, 2026.
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 |
|---|---|---|---|
| USB audio devices might fail to start or produce no sound Some USB Audio Class 1.0 devices display Code 10 or fail in multichannel audio modes after installing KB5124008. | KB5123066 2026-09-08 | Mitigated | 2026-09-14 10:57 PT |
| Remote Desktop Services might stop responding after Sept. 2026 security update Some Windows devices with Remote Desktop enabled might experience Remote Desktop Services (RDS) instability. | KB5123066 2026-09-08 | Resolved KB5129243 | 2026-09-14 10:57 PT |
| Incorrect notifications that "Microsoft Defender Antivirus is turned off" Microsoft Defender Antivirus remains active and functioning correctly despite notifications following the latest update. | | Confirmed | 2026-08-28 16:02 PT |
Issue details
September 2026
USB audio devices might fail to start or produce no sound
| Status | Originating update | History |
|---|---|---|
| Mitigated | KB5123066 2026-09-08 | Last updated: 2026-09-14, 10:57 PT Opened: 2026-09-11, 18:36 PT |
After installing the September 8, 2026, Windows security update (KB5123066), some USB Audio Class 1.0 devices might fail to start or produce audio. Affected devices might experience one or more of the following symptoms:
- The device displays an error in Device Manager: "This device cannot start (Code 10).”
- No audio output.
- Volume controls are unresponsive or remain at zero.
- Sound settings are unresponsive or unavailable.
- Some devices might function in standard stereo configurations but fail when using multichannel audio features, including 8-channel or 3D audio modes. Some customers have reported that they're able to restore audio in these cases by switching to 2-channel mode. (*Note: This behavior is resolved in the out-of-band update released on September 14, 2026. See Resolution section below.)
This issue is limited to USB Audio Class 1.0 devices.
Microsoft Support: IT administrators who need an immediate workaround for the symptoms not addressed yet by the OOB update should contact Microsoft Support for Business for assistance.
Resolution: This issue is partially resolved in the out-of-band (OOB) update released on September 14, 2026, (KB5129243), and updates released after this date. This OOB update resolves the symptoms experienced on devices using 8-channel or 3D audio modes (last bullet point in the list of symptoms documented in this entry). We are working to address the other symptoms and will update this documentation when more information is available.
Affected platforms:
- Client: Windows 11, version 26H1; Windows 11, version 25H2; Windows 11, version 24H2; Windows 11, version 23H2; Windows 10, version 22H2; Windows 10, version 21H2; Windows 10 Enterprise LTSC 2019; Windows 10 Enterprise LTSC 2016
- Server: Windows Server 2025; Windows Server 2022; Windows Server 2019; Windows Server 2016; Windows Server 2012 R2; Windows Server 2012
Remote Desktop Services might stop responding after Sept. 2026 security update
| Status | Originating update | History |
|---|---|---|
| Resolved KB5129243 | KB5123066 2026-09-08 | Resolved: 2026-09-14, 10:00 PT Opened: 2026-09-11, 11:19 PT |
After installing the September 2026 Windows security update (KB5123066), some organizations might experience issues with Remote Desktop Services (RDS).
In some environments, RDS might become unstable, resulting in RDP connections failing after several minutes, sign-in issues, or servers hanging at "Please wait for the Remote Desktop Configuration". Related tools, including Microsoft Management Console (MMC), RDS Licensing Diagnoser, and File Explorer might also become unresponsive. Additionally, the Windows Update page might stop responding and continuously display a loading indicator.
Resolution: This issue is resolved by the out-of-band (OOB) update released on September 14, 2026 (KB5129243), and in updates released after this date.
IT administrators who deployed a temporary mitigation through Group Policy do not need to take any action before installing this OOB update.
This OOB update is cumulative and includes all improvements and security protections contained in previous Windows updates. As a best practice, we recommend installing the latest update available for your devices, as it contains important improvements and issue resolutions, including this one.
Affected platforms:
- Client: Windows 11, version 26H1; Windows 11, version 25H2; Windows 11, version 24H2; Windows 11, version 23H2; Windows 10, version 22H2; Windows 10, version 21H2; Windows 10 Enterprise LTSC 2019; Windows 10 Enterprise LTSC 2016
- Server: Windows Server 2025; Windows Server 2022; Windows Server 2019; Windows Server 2016; Windows Server 2012 R2; Windows Server 2012
August 2026
Incorrect notifications that "Microsoft Defender Antivirus is turned off"
| Status | Originating update | History |
|---|---|---|
| Confirmed | | Last updated: 2026-08-28, 16:02 PT Opened: 2026-08-28, 15:34 PT |
After installing the latest updates for Microsoft Defender Antivirus, notifications might appear stating that "Microsoft Defender Antivirus is turned off," even though the antivirus is functioning correctly and all settings show it as active. These notifications can appear when Windows starts and intermittently afterward. They persist even if notification settings are turned off.
This issue can be observed in any version of Windows or Windows Server with Microsoft Defender Antivirus running with the latest Defender updates.
Next steps: We are working to release a resolution in a future Microsoft Defender Antivirus update and will provide more information when it is available.
Affected platforms:
- Client: Windows 11, version 26H1; Windows 11, version 25H2; Windows 11, version 24H2; Windows 11, version 23H2; Windows 10, version 22H2; Windows 10, version 21H2; Windows 10 Enterprise LTSC 2019; Windows 10 Enterprise LTSC 2016
- Server: Windows Server 2025; Windows Server 2022; Windows Server 2019; Windows Server 2016; Windows Server 2012 R2; Windows Server 2012
Report a problem with Windows updates
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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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