Microsoft has successfully addressed a significant issue affecting Windows Server 2025 systems that caused “boot device inaccessible” errors during startup when using iSCSI storage. The problem specifically impacted servers running NDIS Poll Mode and booting from iSCSI LUNs.

The iSCSI protocol, which enables servers to connect to remote storage devices over TCP/IP networks, is crucial for centralized storage management and data center operations. This technology allows servers to utilize remote storage as if it were local disk space, making it essential for virtualization environments.

The fix was delivered through the February 11, 2025, update (KB5051987), which also resolved USB audio and camera issues introduced by January’s security updates. Users are advised to install this latest update to benefit from these critical improvements.

Additional Fixes and Updates:
– Resolution of BSOD issues on high-core-count Windows Server 2025 devices
– Fixed boot failures on Windows Server 2022 systems with multiple NUMA nodes
– Introduction of new features including hotpatching and next-gen Active Directory
– Support for ‘SMB over QUIC’ alternative ports

Windows Server 2025, which reached general availability in November, is available as a Long-Term Servicing Channel (LTSC) release, with a 180-day free trial through the Microsoft Evaluation Center.