Microsoft Windows Error Code 0xC000021C: How to Fix It

Medium 30-60 minutes Medium Severity Verified June 2026
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Error Code
0xC000021C
Brand
Microsoft Windows
Product Type
operating_system
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30-60 minutes
Error code 0xC000021C indicates that Windows cannot find a browse master (a computer that maintains the list of network resources) on your local network. This typically occurs when the Computer Browser service is not running, network discovery is disabled, or there are firewall issues blocking browsing.
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Tools You'll Need

How to Fix Error Code 0xC000021C

  1. Check the Computer Browser Service

  2. Enable Network Discovery

  3. Temporarily Disable Windows Firewall

    Disabling firewall can expose your PC to network threats. Re-enable it immediately after testing.

  4. Repair System Files with SFC

  5. Ensure Correct Workgroup Settings

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When to Call a Professional

If the error persists after completing these steps, the issue may be deeper, such as corrupt system files that cannot be repaired, or network infrastructure problems. Contact a network technician or Microsoft support.

Frequently Asked Questions

What does error 0xC000021C mean?
It means Windows cannot find a browse master (a computer that maintains the network list) on your local network, usually due to disabled services, firewall blocks, or incorrect network settings.
Is error 0xC000021C serious?
It is a medium-severity error that prevents you from browsing network shares but does not damage your system or data.
Can I fix error 0xC000021C without reinstalling Windows?
Yes, you can try the steps above: enabling the Computer Browser service, network discovery, disabling firewall temporarily, and running SFC. Reinstallation is rarely needed.
How do I restart the Computer Browser service?
Open Services.msc, find 'Computer Browser', right-click and choose 'Start' or 'Restart'. Set startup type to Automatic.
Does error 0xC000021C affect internet browsing?
No, it only affects local network browsing (e.g., seeing other computers in Network folder). Your internet access should remain unaffected.

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