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.
For further assistance, ask other users and QNAP experts in the community. Go to QNAP Community
