The latest cumulative updates for Windows Server in September 2026 are causing significant issues for Remote Desktop Services, leaving some administrators unable to connect without performing a hard reset, even as Microsoft investigates the fault.
Microsoft’s September 2026 cumulative updates for Windows Server are causing a serious disruption to Remote Desktop Services, leaving some administrators unable to connect until they perform a hard reset. The affected releases include KB5122876 for Windows Server 2019, KB5122882 for Windows Server 2022 and KB5122871 for Windows Server 2025, according to BleepingComputer.
Administrators say the fault appears after the updates have been installed for several hours, with sessions hanging or failing altogether. In some cases, rolling back the patch restores Remote Desktop access, although that also removes this month’s security fixes. Microsoft has acknowledged the issue and said it is investigating.
The timing is awkward. Patch Tuesday updates are meant to close security gaps, but this fault has left some organisations choosing between stability and protection. Until Microsoft publishes remediation guidance, server teams are likely to treat the affected updates cautiously, particularly on systems that depend heavily on Remote Desktop administration.
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