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In October 2024, Microsoft confirmed that Windows Server 2025 may encounter a boot device inaccessible error under certain circumstances, primarily affecting enterprise users who utilize the iSCSI protocol.
The iSCSI protocol facilitates connections to remote storage devices, and Windows Server 2025 fully supports it, allowing the system to mount storage components from remote devices. For instance, in NAS systems, storage pools can be configured with the iSCSI protocol—typically, such remote disks are mounted on storage pools or SANs and can be shared—enabling enterprises to access substantial storage capacity without the need for extensive local hard drive installations.
However, due to an error occurring in the NDIS polling mode when booting from an iSCSI LUN, the server system fails to start properly, resulting in an error message that disrupts enterprise operations.
Recently, Microsoft released a new support document announcing that this issue has been resolved in update KB5051987. Windows Server 2025 users who install this or any subsequent updates will be able to mount remote storage devices via iSCSI without issue.
Additionally, Microsoft strongly recommends that enterprises promptly install update KB5051987, as it not only resolves this specific problem but also addresses other known bugs and security vulnerabilities, helping to mitigate potential security risks.
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