- The December 2025 Patch Tuesday updates broke MSMQ on Windows Server and Windows 10 enterprise systems, breaking IIS applications and sites.
- Microsoft is developing a fix, but says affected organizations should contact enterprise support for a workaround or rollback.
- Reported issues include dead queues, failed writes, and false “insufficient resources” errors despite adequate capacity.
Microsoft is asking businesses experiencing issues with Message Queuing (MSMQ) to reach out directly for help with a workaround.
The company recently released its December Patch Tuesday cumulative update, which appears to have broken MSMQ, causing problems in enterprise applications and Internet Information Services (IIS) sites.
MSMQ is a Windows service that allows applications to communicate by sending messages through queues. It enables reliable, asynchronous messaging between systems, even when they are offline, helping to decouple applications and improve resiliency in distributed or enterprise environments.
There is no timetable for a solution
The issues with the patch appear to affect users of Windows 10 22H2, Windows Server 2019, and Windows Server 2016 with updates KB5071546, KB5071544, and KB5071543 installed. Private users don’t seem to be affected by this, only business users.
“People using Windows Home or Pro editions on personal devices are very unlikely to experience this issue. This issue primarily affects enterprise or managed IT environments,” Microsoft said.
“A workaround is available for affected devices. To apply the workaround to mitigate this issue in your organization, contact Microsoft Business Support.”
Microsoft said it was currently working on a fix, but it is not complete yet. The company has no deadline or schedule to release the fix, so we may have to wait until the January 2026 Patch Tuesday batch as well.
For now, IT administrators who are experiencing these issues should contact Microsoft Business Support for help with a workaround or even reverting installed updates.
In the call to businesses, Microsoft said it is aware of different issues following the patch, including dead MSMQ queues, applications unable to write queues, or sites returning “insufficient resources” errors. Apparently some systems also return “Not enough disk space or memory” notifications despite having sufficient resources.
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