Microsoft Windows Error Code 0xC00000A6: How to Fix It
Easy 30-60 minutes Medium Severity
Verified June 2026
- Error Code
- 0xC00000A6
- Brand
- Microsoft Windows
- Product Type
- operating_system
- Severity
- Medium
- DIY Difficulty
- Easy
- Estimated Fix Time
- 30-60 minutes
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Tools You'll Need
- Administrator account
How to Fix Error Code 0xC00000A6
-
Restart Your Computer
-
Boot into Safe Mode
Ensure you have access to an administrator account. -
Run System File Checker (SFC)
Do not interrupt the scan. -
Check Local Security Policy Settings
Changing security policies can affect system security. Only disable if necessary. -
Perform a System Restore
System Restore will undo recent system changes but does not affect personal files.
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When to Call a Professional
If the error persists after trying all steps, contact Microsoft Support or a certified technician. This may indicate a deeper system corruption or hardware issue.Frequently Asked Questions
What does error code 0xC00000A6 mean?
It means Windows has blocked an anonymous login attempt. This can happen due to security policy changes or corrupted system files.
Can I fix error 0xC00000A6 without Safe Mode?
If you can log in normally, you can skip Safe Mode. But if you can't log in, Safe Mode is necessary.
Will System Restore delete my files?
No, System Restore does not affect personal files like documents or photos. It only undoes system changes.
Is this error caused by a virus?
While possible, it's not common. Malware can alter security settings. Run a full antivirus scan if you suspect infection.
Can I disable the anonymous login restriction permanently?
Yes, but doing so may reduce security. Only disable it if necessary, and re-enable it after troubleshooting.