Synology NAS Error Code 48: How to Fix It

Medium 20-40 minutes Medium Severity Verified June 2026
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Error Code
48
Brand
Synology
Product Type
nas
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
20-40 minutes
Synology NAS error code 48 indicates that the DSM rsync server connection has failed. This typically occurs when backing up data to a remote rsync server, preventing successful synchronization. The error is often due to network issues, incorrect credentials, or server configuration problems.
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Tools You'll Need

How to Fix Error Code 48

  1. Check Network Connectivity

  2. Verify Rsync Server Credentials

  3. Check Rsync Server Configuration

    Modifying server firewall settings may expose services. Only open necessary ports.

  4. Test with a Different Backup Destination

  5. Update DSM and Packages

    Back up your DSM configuration before updating.

  6. Review Logs for Details

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When to Call a Professional

Call Synology support if you've verified network, credentials, and server config but the error persists, or if you suspect a hardware issue like a failing network port.

Frequently Asked Questions

What causes Synology error code 48?
Error 48 means the rsync server connection failed. Common causes: network issues, incorrect credentials, rsync service not running on the server, firewall blocking ports, or outdated DSM.
How do I test rsync on Synology?
You can test rsync via SSH: run 'rsync -avz /volume1/test/ user@remote:/path/' with appropriate credentials. If it fails, the error message will help diagnose.
Can a firewall cause error 48?
Yes, a firewall on either the NAS or the remote server can block the rsync port (22 for SSH, 873 for daemon). Ensure the port is open.
Do I need to enable rsync on Synology?
If you're using rsync as a destination, go to Control Panel > File Services > rsync and enable 'Enable rsync service'. For source, it's usually automatic.
Will reformatting my NAS fix error 48?
Reformatting is not recommended as a first step. It would delete data and likely not solve the issue unless the problem is a corrupted system partition. Try other steps first.

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