KB5074975: [Message queuing (MSMQ) (known issue)] Fixed

December 18, 2025—KB5074975 (OS Build 17763.8148) Out-of-band

Applies to: Windows Server 2019
This out-of-band update includes fixes and improvements that are part of the following update:

• December 9, 2025—KB5071544 (OS Build 17763.8146)

The following is a summary of the issues that this update addresses when you install this update. The bold text within the brackets indicates the item or area of the change we are documenting.

• [Message queuing (MSMQ) (known issue)] Fixed: After installing the Windows updates released on December 9, 2025, users experienced issues with the Message Queuing (MSMQ) functionality. This issue also impacts a clustered MSMQ environment under load. This issue might lead to message queues becoming inactive, messages about insufficient resources, applications unable to write to message queues, error messages about the message cannot be created, or messages about insufficient disk space or memory. Individuals 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.