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Windows Server 2012 R2 known issues

Microsoft lists 1 open issue for Windows Server 2012 R2. Below is every issue Microsoft has listed for this version, with the update that caused it and when it was resolved.

IssueStatusCaused byOpenedResolved or updated
SQL Server linked server connections might remain openConfirmedKB5126836, 2026-10-1311 November 202611 November 2026
USB audio devices might fail to start or produce no soundResolved KB5135582KB5123066, 2026-09-0810 November 20267 November 2026
Remote Desktop Services might stop responding after Sept. 2026 security updateResolved KB5129243KB5123066, 2026-09-0811 September 202614 September 2026
Incorrect notifications that "Microsoft Defender Antivirus is turned off"Resolved–28 August 202630 September 2026
Windows Server Update Services sync operations might have issues or time outResolved–18 July 202620 July 2026
Deleting a file from the Recycle Bin displays an internal filename in the dialogResolved KB5099444KB5094041, 2026-06-0918 June 202614 July 2026
Message Queuing (MSMQ) might fail with the December 2025 Windows security updateResolved KB5074978KB5071503, 2025-12-0913 December 202518 December 2025
Smartcard authentication issues might occur with the October 2025 Windows updateResolvedKB5066794, 2025-10-1418 October 202523 October 2025

Source: Microsoft's release health page for Windows Server 2012 R2. Dates are in UTC.

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