QNAP NAS Error Code 50: How to Fix It

Medium 20-45 minutes Medium Severity Verified June 2026
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Error Code
50
Brand
QNAP
Product Type
nas
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
20-45 minutes
QNAP Error Code 50 indicates that the SMB (Server Message Block) service on your NAS device has unexpectedly stopped, which means Windows file sharing and network drive access will be unavailable. This typically happens after a firmware update, a configuration change, or a software conflict on the NAS. While no data is lost, users on your network will be unable to browse shared folders or access network drives until the SMB service is restored.
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Tools You'll Need

How to Fix Error Code 50

  1. Log In to the QNAP Web Administration Interface

    Do not perform a hard reset or power off the NAS during this process, as doing so while drives are active could risk data integrity. Always work through the web interface first.

  2. Check the Notification Center for Related Alerts

  3. Attempt to Restart the SMB Service via Control Panel

  4. Restart the NAS Services via the App Center

  5. Review and Repair SMB Configuration Settings

  6. Check System Logs via SSH for Deeper Diagnostics

    Only use SSH if you are comfortable with command-line interfaces. Entering incorrect commands could affect NAS configuration. Do not delete or modify system files unless directed by QNAP support.

  7. Update QTS Firmware to the Latest Version

    Always back up your NAS configuration and ensure all drives are healthy (check Storage & Snapshots > Storage > Disks) before applying a firmware update. Do not interrupt the update process or power off the NAS during firmware installation.

  8. Perform a NAS Reboot as a Last Resort

    Ensure no users are actively reading or writing files to the NAS before initiating a reboot to prevent data corruption or incomplete file transfers.
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When to Call a Professional

Contact QNAP technical support if the SMB service continues to fail after firmware updates, service restarts, and configuration resets. You should also seek professional help if SSH log files show signs of file system corruption, if the NAS is part of an Active Directory domain environment and you suspect authentication-related failures, or if the error recurs repeatedly after every reboot. QNAP's official support portal (support.qnap.com) can open a ticket and may request diagnostic logs from your device.

Frequently Asked Questions

What does QNAP Error Code 50 mean?
QNAP Error Code 50 means the SMB (Server Message Block) service on your NAS has stopped running. SMB is the protocol that allows Windows computers and other devices on your network to access shared folders and network drives on the NAS. When this service stops, file sharing over the network is unavailable until the service is restarted.
Will I lose my data if I get Error Code 50 on my QNAP NAS?
No, Error Code 50 does not mean your data is lost or at risk. It only means the SMB file-sharing service has stopped. Your files remain safely stored on the NAS drives. Once you restart the SMB service, network access to your data will be restored.
Why does my QNAP SMB service keep stopping after every reboot?
If your QNAP SMB service stops repeatedly after each reboot, the most common causes are a conflicting third-party app installed on the NAS, a corrupt Samba configuration file, outdated firmware with a known bug, or a port conflict with another service. Check your installed apps in App Center for conflicts, review SSH logs at /var/log/samba/log.smbd, and ensure your firmware is fully up to date.
How do I restart the SMB service on a QNAP NAS?
You can restart the SMB service by going to Control Panel > Network & File Services > Win/Mac/NFS/WebDAV > Microsoft Networking, toggling the SMB option off, clicking Apply, waiting 10 seconds, toggling it back on, and clicking Apply again. Alternatively, you can restart it via SSH by running the command: /etc/init.d/smbd.sh restart
Does a QNAP firmware update fix Error Code 50?
In many cases, yes. QNAP regularly releases firmware updates that patch known Samba and SMB service bugs. If your NAS is running an outdated version of QTS, updating to the latest firmware through Control Panel > System > Firmware Update is one of the most effective ways to permanently resolve Error Code 50 and prevent it from recurring.

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