Microsoft has successfully addressed several significant issues affecting Windows Server 2025 systems with high core counts. The problems, which were first acknowledged in October, primarily impacted servers with more than 256 logical processors.

## Issues Resolved

Affected systems previously experienced a range of symptoms including:
– Failed or stalled installation and upgrade processes
– Extended server start-up times (up to three hours in some cases)
– Blue Screen of Death (BSOD) errors when launching applications or restarting
– Inconsistent triggering of these issues across impacted servers

## Solution and Verification

The fixes have been implemented in updates released since the KB5046617 cumulative update from November’s Patch Tuesday. Microsoft recommends installing the latest security updates to resolve these problems.

IT administrators can verify if their systems are affected by checking the logical processor count in Windows Task Manager’s Performance tab. Systems showing more than 256 logical processors were vulnerable to these issues.

## Temporary Workaround

For administrators unable to immediately install the latest updates, Microsoft provides a workaround:
1. Enter UEFI Setup during server restart
2. Navigate to core configuration settings
3. Adjust cores per socket to ensure total logical processors remain at or below 256
4. Restart the server

The total logical processor count is calculated by: (number of sockets × cores per socket × logical processors per core).

## Additional Recent Issues

Microsoft has also addressed several other Windows Server 2025 issues, including:
– Domain controller accessibility problems after restarts
– Windows Hello login failures after April 2025 security updates
– Authentication issues with Credential Guard when using Kerberos PKINIT
– Compatibility problems with SenseShield Technology’s sprotect.sys driver causing BSOD errors

These fixes demonstrate Microsoft’s ongoing commitment to resolving critical issues affecting Windows Server 2025 deployments.