By Sergiu Gatlan
Publication Date: 2025-12-15 09:04:00
Microsoft has confirmed that the December 2025 security updates are breaking Message Queuing (MSMQ) functionality, affecting enterprise applications and Internet Information Services (IIS) websites.
This known issue affects Windows 10 22H2, Windows Server 2019, and Windows Server 2016 systems that have installed the KB5071546, KB5071544, and KB5071543 security updates released during this month’s Patch Tuesday.
On impacted systems, users are experiencing a wide range of symptoms, from inactive MSMQ queues and IIS sites failing with “insufficient resources” errors to applications unable to write to queues. Some systems are also displaying misleading “There is insufficient disk space or memory,” despite having more than enough resources available.
According to Microsoft, the problem stems from security model changes introduced to the MSMQ service that have modified permissions on a critical system folder, requiring MSMQ users to have write access to a directory usually…
