Microsoft Issues Emergency Fix After Patch Tuesday Breaks Remote Desktop Services

Microsoft's September 8 Patch Tuesday update, which addressed a record 974 CVEs, caused significant problems for many IT teams. Three days later, Microsoft confirmed that Remote Desktop Services could become unstable, leading to failed RDP connections, sign-in issues, and servers hanging during configuration. Related tools such as Microsoft Management Console, the RDS Licensing Diagnoser, File Explorer, and the Windows Update page were also affected.

On September 14, Microsoft released an emergency cumulative update (KB5129195) to fix these problems. The update also resolved issues affecting Hyper-V users, including virtual machines failing to display or access shared folders through Plan9, and problems that caused USB Audio Class 1.0 devices to stop working or fail to start after the original patch.

Microsoft advised that IT administrators who had already applied a temporary Group Policy mitigation do not need to take further action before installing the new update, and recommended all users install the latest cumulative update to ensure they receive all relevant fixes. This marks the sixth emergency patch Microsoft has issued to address failures stemming from September's Patch Tuesday release.