Windows admins report that this month's cumulative updates for Windows Server 2019, 2022, and 2025 are breaking Remote Desktop Services, with servers working fine for a few hours before connections begin to fail. Existing sessions can get stuck unable to disconnect, new logins hang and time out, and in many cases only a hard reset restores service. Some administrators say uninstalling the September patch is the only reliable fix so far.
bleepingcomputer.com
· 2026-09-10
Microsoft has acknowledged that the August 2026 security update can cause 0xc0000409 errors tied to CompatTelRunner.exe on Windows Server 2016 machines running the Compatibility Appraiser telemetry service. The bug affects both physical hardware and virtual machines, including VMware and Azure deployments, generating repeated Application Error log entries under Event ID 1000.
bleepingcomputer.com
· 2026-09-08
Microsoft has acknowledged that a memory-management change in Windows Server 2025 is causing crashes, memory corruption, and access violations in applications using Address Windowing Extensions (AWE), including SQL Server instances with Lock Pages in Memory enabled. Affected systems may show error code 0xC0000005, failed database maintenance tasks, crash dumps, and unexpected service restarts.
bleepingcomputer.com
· 2026-09-08
GoKawiil