Windows containers

Winsage
June 16, 2025
Microsoft has identified an issue with the June 2025 security updates that causes the Dynamic Host Configuration Protocol (DHCP) service to freeze on certain Windows Server systems. This affects the service's ability to apply renewals of unicast IP addresses, impacting network operations. Microsoft has acknowledged that the DHCP Server service may intermittently stop responding after the update and is working on a resolution. Additionally, other issues affecting Windows Server systems have been addressed, including application failures and authentication problems on domain controllers. Out-of-band updates were previously issued to fix bugs causing Hyper-V virtual machines to restart or freeze, and emergency updates were released for issues with Windows containers on certain Windows Server versions.
Winsage
May 27, 2025
Microsoft has released an emergency update, KB5061906, to address unexpected freezes and restarts affecting Hyper-V virtual machines on Windows Server 2022, particularly Azure confidential VMs. This cumulative out-of-band update resolves a critical issue in the direct send path for guest physical addresses, which could cause these VMs to stop responding or restart. The update is not automatically installed and must be manually downloaded from the Microsoft Update Catalog. Standard Hyper-V deployments are largely unaffected, with rare exceptions. Organizations using Windows Server 2022 with Hyper-V should apply this update if they have not yet deployed the May 2025 Windows security update (KB5058385).
Winsage
April 17, 2025
Microsoft released emergency updates for Windows Server to address startup failures in containers operating under Hyper-V isolation mode, caused by compatibility issues with the 2025.04 B container images. The updates enhance access to essential system files from the Windows Server host, improving compatibility and reliability. These out-of-band updates for Windows Server 2019, 2022, and 2025 must be manually downloaded from the Microsoft Update Catalog, as they will not be delivered through Windows Update. This update follows previous challenges, including authentication issues and boot problems caused by earlier security updates for Windows Server 2019 and 2022.
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