Synology NAS Error Code 46: How to Fix It

Easy 10-30 minutes Medium Severity Verified June 2026
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Error Code
46
Brand
Synology
Product Type
nas
Severity
Medium
DIY Difficulty
Easy
Estimated Fix Time
10-30 minutes
Error code 46 on your Synology NAS indicates that Cloud Sync encountered an upload failure. This usually happens due to network issues, authentication problems, or large file constraints. Follow these steps to identify and resolve the cause.
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How to Fix Error Code 46

  1. Check Cloud Sync Logs

  2. Verify Cloud Provider Authentication

  3. Check File Size and Type Limitations

  4. Inspect Network Connectivity

  5. Update Cloud Sync and DSM

    Back up your data before performing a DSM update.

  6. Disable and Re-enable Cloud Sync Task

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When to Call a Professional

If you've tried all steps and the error persists, there may be a deeper issue with your network infrastructure or cloud provider. Contact Synology support or a network professional.

Frequently Asked Questions

What does Synology error 46 mean?
Error 46 indicates a Cloud Sync upload failure. It occurs when the NAS cannot upload files to the connected cloud service due to authentication, network, or file issues.
Why does Cloud Sync keep failing on my Synology?
Common causes include expired authentication tokens, network connectivity problems, file size limits, or outdated software. Follow the troubleshooting steps above to resolve it.
How do I check Cloud Sync logs on Synology?
Open Cloud Sync in DSM, select your sync task, and click the log icon. You'll see detailed error messages for failed files.
Can I fix error 46 without losing data?
Yes, error 46 is typically a connection issue and does not cause data loss. Your files remain in the local NAS and the cloud provider.
Do I need to reinstall Cloud Sync to fix error 46?
Reinstalling Cloud Sync is rarely needed. Usually, re-authorizing the cloud account or updating the package resolves the issue.

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