How can I fix a 0x8007003B error when transferring data with Windows?

Last modified date: 2025-07-25

Applicable Products

All NAS series

Symptom

When I try to transfer files using a Windows device, this error message appears: 0x8007003B: An unexpected network error occurred

Recommendation

There are many possible causes for this error message. Without more information, there isn't a clear solution. QNAP recommends trying one or more of the following solutions:

Try to transfer content with another PC. This may indicate whether the issue is related to the original PC, or the NAS itself.
Try to create a new file or folder on the NAS. Verify that you have the correct permissions by checking the system logs.
Disable Windows Defender and any other antivirus software.
Disable any network firewalls.
Disable the Windows search function.

If the issue persists, it may be related to other Windows related issues. QNAP recommends contacting Microsoft directly for a detailed analysis.

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