⚠️ 2 verified solutions available for Error 8569 — Last updated 2026-03-31
Error 8569 📋

Fix ERROR_DS_NO_BEHAVIOR_VERSION_IN_MIXEDDOMAIN — Windows Error Code 8569

Error 8569 (ERROR_DS_NO_BEHAVIOR_VERSION_IN_MIXEDDOMAIN) is a Windows Active Directory error that occurs when the forest functional level cannot be raised to the requested value since one or more domains are still in mixed domain mode.. This guide provides step-by-step solutions to resolve this issue.

🏷️ Code: 8569 📛 ERROR_DS_NO_BEHAVIOR_VERSION_IN_MIXEDDOMAIN 📅 Updated: 2026-03-31 ⏱️ 2 Solutions
⚡ Quick Fix

Rejoin the Domain: Open System Properties → Change → set to Workgroup → OK → Restart

👇 See all 2 solutions below
🐞 Auto-Fix Script for Error 8569
⚠️ How to use: Open PowerShell as Administrator, paste the code above, and press Enter.
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📑 Table of Contents
What is Error 8569? Common Causes Step-by-Step Solutions Prevention Tips Related Errors

💡 What is Error 8569?

Windows System Error Code 8569, known as ERROR_DS_NO_BEHAVIOR_VERSION_IN_MIXEDDOMAIN, is a Active Directory error that occurs during Active Directory and directory services. The error indicates that: The forest functional level cannot be raised to the requested value since one or more domains are still in mixed domain mode. When this error is encountered, the Windows operating system was unable to complete the requested operation within the directory services subsystem. The error code 8569 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_NO_BEHAVIOR_VERSION_IN_MIXEDDOMAIN 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 forest functional level cannot be raised to the requested value since one or more domains are still in mixed domain mode.
  • Computer lost domain trust
  • Time sync beyond Kerberos limit
  • DNS preventing DC discovery
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✅ Step-by-Step Solutions

1 Rejoin the Domain
  1. Open System Properties → Change → set to Workgroup → OK → Restart
  2. Then change back to Domain → enter domain name → OK → Restart
  3. This re-establishes the trust relationship
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Show Advanced Solutions (1 more)
2 Advanced Diagnostic for ERROR_DS_NO_BEHAVIOR_VERSION_IN_MIXEDDOMAIN
  1. Open Windows Event Viewer (eventvwr.msc)
  2. Navigate to Windows Logs → System to find Event ID 8569
  3. Look for associated warnings that occurred immediately before the system crashed
  4. Right-click the entry and export the log file for further analysis

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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 "*8569*" -or $_.Message -like "*ERROR_DS_NO_BEHAVIOR_VERSION_IN_MIXEDDOMAIN*"} | 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
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Last updated: 2026-03-31
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Based on Official Microsoft Documentation
Solutions Tested on Windows 10 & 11
Error codes sourced from Microsoft Win32 SDK. Updated 2026-03-31.
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