Windows Server 2025 - Automatic Shutdown with Reason Code: 0x500ff

Question

We are using Windows Server 2025, and the server is automatically shutting down. Here are the OS details:

Edition: Windows Server 2025 Datacenter
Version: 24H2
Installed on: 1/8/2025
OS build: 26100.2605
Experience: Windows Feature Experience Pack 1000.26100.36.0

We found the following error:

The process C:\Windows\system32\winlogon.exe (PROD-NETLABS) has initiated the power off of computer PROD-NETLABS on behalf of user NT AUTHORITY\SYSTEM for the following reason: No title for this reason could be found
Reason Code: 0x500ff
Shutdown Type: power off
Comment: 

This incident is causing unexpected shutdowns, and rebooting the server, which is a production server, is leading to significant impacts for us.

Answer 1

Hello Himanshu Singhal,

Thank you for posting in Q&A forum.

0x500ff typically indicates that the shutdown was initiated by the system, often due to a critical issue or a specific administrative action. Here are some steps to troubleshoot：

1. Check Event Logs: Review the system event logs to identify any related events that occurred around the time of the shutdown. Look for Event IDs such as 1074, 41, 6008, and 6009, which can provide more context about the shutdown.
2. Review System Updates: Ensure that all system updates, including Windows updates and driver updates, are installed. Sometimes, pending updates can cause unexpected shutdowns.
3. Hardware Check: Verify that there are no hardware issues, such as overheating or power supply problems, which could trigger an automatic shutdown.
4. Software Conflicts: Check for any recently installed software or updates that might be causing conflicts. Uninstalling or updating these programs might resolve the issue.

Reference：

Troubleshoot unexpected reboots using system event logs - Windows Server

I hope the information above is helpful.

If you have any questions or concerns, please feel free to let us know.  

Best Regards,  

Daisy Zhou

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