Microsoft Windows Error Code 0xC00000AC: How to Fix It

Medium 20-40 minutes Medium Severity Verified June 2026
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Error Code
0xC00000AC
Brand
Microsoft Windows
Product Type
operating_system
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
20-40 minutes
Error code 0xC00000AC in Windows indicates that a named pipe required by a program or service is not available. Named pipes are used for inter-process communication, and this error usually occurs when a program tries to access a pipe that doesn't exist or is not running. This guide will help you resolve the issue through simple software fixes.
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How to Fix Error Code 0xC00000AC

  1. Restart Your Computer

  2. Run System File Checker (SFC)

  3. Run DISM Tool

  4. Check Related Services

    Be careful not to change other services unless you're sure.

  5. Identify the Offending Program

  6. Perform a Clean Boot

    After troubleshooting, re-enable services in msconfig to restore normal startup.

  7. System Restore

    System Restore may remove recently installed programs, but your personal files remain.
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When to Call a Professional

If you've tried all steps and the error persists, consider seeking professional help. The issue may involve deeper system corruption or hardware problems. A technician can use advanced diagnostics to repair Windows or restore your system.

Frequently Asked Questions

What does Windows error code 0xC00000AC mean?
It means STATUS_PIPE_NOT_AVAILABLE, indicating that a named pipe required by a program is missing or not accessible. This often happens due to corrupt system files or misconfigured services.
Can error 0xC00000AC be caused by malware?
Yes, malware can damage system files or interfere with named pipes. Run a full antivirus scan using Windows Defender or a trusted third-party tool.
Will System Restore delete my files?
No, System Restore only reverts system settings and installed programs, not your personal files like documents, photos, or music.
Is error 0xC00000AC the same as 0xC00000AC?
Yes, 0xC00000AC is the same code; it's sometimes written without leading zeros. Both refer to STATUS_PIPE_NOT_AVAILABLE.
How do I check if a named pipe is available?
Named pipes are internal; you can't easily check them directly. Instead, ensure the related services (like RPC) are running and the program using the pipe is properly installed.

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