Microsoft has identified three major issues affecting Windows Server 2025: unexpected English text display during installation, severe performance issues on high-core servers, and boot failures in iCSI environments. High-core systems with 256 or more processors may experience blue screens and prolonged boot times, while certain iSCSI configurations prevent servers from booting altogether.
As reported by BleepingComputer, users of Windows Server 2025 may face several disruptive symptoms. Some may experience up to three-hour delays during restarts, particularly on servers with extensive processor counts.
Additionally, impacted systems may display BSOD errors unpredictably when performing tasks like launching applications or rebooting. Inconsistent triggering of these issues has made diagnosis challenging, adding an extra layer of complexity for IT administrators managing large data centres or high-powered systems.
For administrators suspecting their systems might be impacted, Microsoft has outlined a straightforward diagnostic step: accessing the Windows Task Manager (Ctrl + Shift + Esc) and checking the Performance tab to verify the number of logical processors. If the system reports more than 256 logical processors, it may be vulnerable to these performance and stability issues.
While a permanent fix is in development, Microsoft has provided an interim workaround for systems experiencing these issues. Administrators can sidestep some of the instabilities by manually limiting the active logical processors to 256 or fewer.
Users can restart and access the UEFI setup, adjust core allocation, confirm the total processor count, and finally reboot the server.
In addition to processor-related issues, Microsoft has also listed another issue involving the Windows Server 2025 installation process, where parts of the setup text display in English, even if another language has been selected.
Microsoft explains that this glitch only affects installations done via external media such as USB drives or CDs on server media version 25100.1742 or newer. The bug appears specifically when users attempt to install Windows Server 2005 with the enabled Multilingual User Interface (MUI). The unintended English text may be confusing, particularly for users in non-English-speaking regions.
The third issue that Microsoft reported affects servers utilising iSCSI (Internet Small Computer Systems Interface) technology under certain configurations. After startup, servers booting from an iSCSI LUN in SDIS Poll Mode may display a “boot device inaccessible” error.
This prevents affected servers from completing the boot process successfully, rendering the machine unusable until the issue is addressed.
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