Microsoft December 2025 Security Updates Breaking Message Queuing (MSMQ) Functionality Affects IIS Sites

Microsoft’s December 2025 security updates have unleashed an unexpected headache for enterprise admins relying on Message Queuing (MSMQ). Installed via KB5071546 on December 9, the patch targeting OS Build 19045.6691 alters MSMQ’s security model, leading to widespread failures in queue operations. Confirmed on December 12, the issue is most severe in high-load clustered environments, causing […]

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