Microsoft Windows Error Code 0xC000020C: How to Fix It
Easy 15-30 minutes Medium Severity
Verified June 2026
- Error Code
- 0xC000020C
- Brand
- Microsoft Windows
- Product Type
- operating_system
- Severity
- Medium
- DIY Difficulty
- Easy
- Estimated Fix Time
- 15-30 minutes
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Tools You'll Need
- Admin access to Windows
How to Fix Error Code 0xC000020C
-
Restart Your Computer and Network Devices
-
Run Network Troubleshooter
-
Update Network Adapter Drivers
Back up important data before updating drivers. -
Reset TCP/IP Stack
This resets network settings to default. -
Check Firewall and Antivirus Settings
Only disable security temporarily for testing. -
Run System File Checker (SFC)
Do not close Command Prompt during scan.
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When to Call a Professional
If none of these steps work, contact your ISP to check for service outages or a professional IT technician to diagnose hardware issues.Frequently Asked Questions
What does error 0xC000020C mean?
It means a TCP connection was disconnected in Windows, often due to network driver issues, firewall blocks, or system file corruption.
Can a faulty router cause error 0xC000020C?
Yes, a faulty or misconfigured router can cause this error. Restart or reset your router to rule out hardware issues.
Will resetting TCP/IP delete my files?
No, resetting TCP/IP only restores network settings to defaults and does not affect personal files.
Is error 0xC000020C a virus?
No, it's a network connectivity error. However, malware can interfere with connections, so run a full antivirus scan if you suspect infection.
How do I prevent error 0xC000020C from recurring?
Keep Windows and network drivers updated, use a reliable firewall configuration, and periodically run SFC scans to maintain system health.