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Microsoft: September updates cause RDS failures on Windows Server

September 14, 2026 · BleepingComputer · Severity: MEDIUM

Microsoft's September 2026 cumulative updates are causing Remote Desktop Services failures on Windows Server systems, disrupting enterprise remote administration workflows. The issue affects multiple Windows Server versions and stems from changes to the RDS authentication stack in the latest patch cycle. 📌 **Analyst Note:** While not a security vulnerability per se, RDS failures in enterprise environments can force IT teams to adopt less secure remote access methods as workarounds, potentially increasing the attack surface until Microsoft releases a fix.

Key Takeaways

  • Microsoft's September 2026 cumulative updates are causing Remote Desktop Services failures on Windows Server systems, preventing legitimate RDP connections and disrupting remote administration workflows for enterprise IT teams.
  • The issue affects multiple Windows Server versions and appears to be related to changes in the RDS authentication stack introduced in the September patch cycle, with no immediate fix available.
  • Administrators affected by the RDS failures should monitor Microsoft's known issues tracker for a fix while considering temporary workarounds such as alternative remote access methods or selective patch deployment.
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