Microsoft Windows Error Code 0x8007003A: How to Fix It

Easy 15-30 minutes Medium Severity Verified June 2026
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Error Code
0x8007003A
Brand
Microsoft Windows
Product Type
hresult
Severity
Medium
DIY Difficulty
Easy
Estimated Fix Time
15-30 minutes
Windows error 0x8007003A means your computer received a bad response from a network server. This typically happens during file transfers, updates, or when accessing shared resources. The fix involves checking your network connection, resetting network components, and ensuring server compatibility.
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How to Fix Error Code 0x8007003A

  1. Restart Your Computer and Network Devices

  2. Run the Network Troubleshooter

  3. Reset Network Settings

    This will reset your network configuration. You may need to reconfigure VPN or static IP settings afterward.

  4. Disable IPv6 Temporarily

  5. Check Firewall and Antivirus Settings

    Disabling security software can expose your computer to threats. Only do this temporarily for testing.

  6. Clear DNS Cache

  7. Check Server Compatibility (For File Sharing/Network Drives)

    SMB 1.0 is outdated and insecure. Use only if necessary and consider upgrading the server.
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When to Call a Professional

If the error persists after all steps, the issue may be with your network hardware, ISP, or server configuration. Contact your network administrator or ISP support. For persistent errors in a corporate environment, consult your IT department.

Frequently Asked Questions

What causes Windows error 0x8007003A?
This error is caused by a bad network response, often due to network congestion, misconfigured firewall or antivirus, corrupted network settings, or incompatible SMB protocol versions.
Can error 0x8007003A affect Windows Update?
Yes, this error can occur during Windows Update if the update server returns a bad response. Running the Windows Update troubleshooter or resetting network settings often resolves it.
Is error 0x8007003A related to malware?
While not directly caused by malware, certain malware can modify network settings, leading to this error. Run a full antivirus scan if you suspect infection.
How do I fix error 0x8007003A when copying files over the network?
Ensure both computers are on the same network and have file sharing enabled. Check SMB protocol compatibility (enable SMB 1.0 if needed). Restart both computers and try again.
Will resetting Windows fix error 0x8007003A?
Resetting Windows can resolve persistent network issues but should be a last resort. Try all other steps first, and back up your data before resetting.

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