Rejoin the Domain: Open System Properties → Change → set to Workgroup → OK → Restart
👇 See all 2 solutions belowWhat is Error 8371?
Windows System Error Code 8371, known as ERROR_DS_OBJ_CLASS_NOT_DEFINED, is a Active Directory error that occurs during Active Directory and directory services. The error indicates that: The specified class is not defined. When this error is encountered, the Windows operating system was unable to complete the requested operation within the directory services subsystem. The error code 8371 is returned by the GetLastError() function and provides developers with a specific identifier to diagnose the root cause of the failure. The symbolic name ERROR_DS_OBJ_CLASS_NOT_DEFINED maps directly to this numeric code and is commonly referenced in Microsoft documentation, developer forums, and system logs. Understanding this error and its context within Active Directory and directory services is essential for effective troubleshooting.
Common Causes
- System resource conflict: The specified class is not defined.
- Computer lost domain trust
- Time sync beyond Kerberos limit
- DNS preventing DC discovery
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Read the full guide →Step-by-Step Solutions
- Open System Properties → Change → set to Workgroup → OK → Restart
- Then change back to Domain → enter domain name → OK → Restart
- This re-establishes the trust relationship
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Diagnostic Command
Run this PowerShell command to find related events in your system log:
Get-EventLog -LogName System -Newest 20 | Where-Object {$_.Message -like "*8371*" -or $_.Message -like "*ERROR_DS_OBJ_CLASS_NOT_DEFINED*"} | Format-List💡 Open PowerShell as Administrator, paste the command above, and press Enter.
Prevention Tips
- Ensure reliable NTP sources
- Monitor DC health with dcdiag
- Use redundant DNS servers