Windows Server 2025 known issues
Microsoft lists 1 open issue for Windows Server 2025. Below is every issue Microsoft has listed for this version, with the update that caused it and when it was resolved.
| Issue | Status | Caused by | Opened | Resolved or updated |
|---|---|---|---|---|
| SQL Server linked server connections might remain open | Confirmed | OS Build 26100.33650, KB5126646, 2026-10-13 | 11 November 2026 | 11 November 2026 |
| Users might be unable to sign in to OWA or send emails on Exchange Server | Resolved KB5131080 | OS Build 26100.33650, KB5126646, 2026-10-13 | 10 November 2026 | 10 November 2026 |
| USB audio devices might fail to start or produce no sound | Resolved KB5131080 | OS Build 26100.33438, KB5122871, 2026-09-08 | 10 November 2026 | 10 November 2026 |
| Remote Desktop Services might stop responding after Sept. 2026 security update | Resolved KB5129235 | OS Build 26100.33438, KB5122871, 2026-09-08 | 11 September 2026 | 14 September 2026 |
| Incorrect notifications that "Microsoft Defender Antivirus is turned off" | Resolved | N/A | 28 August 2026 | 30 September 2026 |
| Windows Server Update Services sync operations might have issues or time out | Resolved | N/A | 18 July 2026 | 20 July 2026 |
| GIF functionality in the Windows Emoji Panel might become unavailable | Resolved KB5120233 | N/A | 30 June 2026 | 11 August 2026 |
| Deleting a file from the Recycle Bin displays an internal filename in the dialog | Resolved KB5099536 | OS Build 26100.32995, KB5094125, 2026-06-09 | 18 June 2026 | 14 July 2026 |
| Domain controllers may restart repeatedly after installing April security update | Resolved KB5091157 | OS Build 26100.32690, KB5082063, 2026-04-14 | 17 April 2026 | 19 April 2026 |
| Apps might become unresponsive when saving files to cloud-backed storage | Resolved KB5078135 | OS Build 26100.32230, KB5073379, 2026-01-13 | 21 January 2026 | 23 January 2026 |
| Connection and authentication failures in Azure Virtual Desktop and Windows 365 | Resolved KB5077793 | OS Build 26100.32230, KB5073379, 2026-01-13 | 14 January 2026 | 17 January 2026 |
| USB mouse and keyboard not working in the Windows Recovery Environment (WinRE) | Resolved KB5070773 | OS Build 26100.6899, KB5066835, 2025-10-14 | 18 October 2025 | 20 October 2025 |
| Smartcard authentication issues might occur with the October 2025 Windows update | Resolved | OS Build 26100.6899, KB5066835, 2025-10-14 | 18 October 2025 | 23 October 2025 |
| IIS websites might fail to load | Resolved KB5068861 | OS Build 26100.6899, KB5066835, 2025-10-14 | 16 October 2025 | 11 November 2025 |
| Directory synchronization fails for AD groups exceeding 10,000 members | Resolved KB5068861 | OS Build 26100.6584, KB5065426, 2025-09-09 | 15 October 2025 | 11 November 2025 |
| Updates installed via WUSA might fail if installed from a shared folder | Resolved KB5094125 | OS Build 26100.4349, KB5060842, 2025-06-10 | 15 August 2025 | 9 June 2026 |
| Windows Server 2022 and Server 2019 unexpectedly upgraded to Windows Server 2025 | Resolved KB5082063 | N/A | 9 November 2024 | 14 April 2026 |
Source: Microsoft's release health page for Windows Server 2025. Dates are in UTC.
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