016-391C625

Xerox C625 error 016-391: Troubleshooting Guide

The Xerox C625 error 016-391 is a system notification indicating a network protocol communication failure. This issue typically arises when the device fails to authenticate with an external server for scan-to-email or scan-to-folder operations. Troubleshooting requires checking the network interface settings to clear the obstruction. This multifunctional device is intended for demanding professional environments.

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Common causes

  • 1Expired credentials for network protocols.
  • 2IP address conflict within the subnet.
  • 3Firmware mismatch with current network security policies.
  • 4Blocked firewall port for scan services.

Solutions

Quick Diagnostics

If you see the Xerox C625 error 016-391, check if other workstations on the same network can access the target server. Often, the error indicates a credential timeout or an invalid gateway setting on the printer.

Step-by-step Solution

  1. Restart services: Power off the device, wait 30 seconds, and restart to clear pending jobs.
  2. Check IP: Access the panel and ensure the IP is static and conflict-free.
  3. Check credentials: Verify that your SMTP or SMB credentials have not expired.

Maintenance and Prevention

Regularly update the device firmware via the official support portal. Use genuine Xerox consumables to ensure proper communication with the onboard chip sensors.

When to call a technician

If network configurations are correct but the error persists, contact a technician to inspect the printer's main network interface card.

Device technical specifications

  • Technology: Color Laser Multifunction
  • Speed/Performance: Up to 50 ppm
  • Connectivity: Ethernet 10/100/1000, Optional Wi-Fi
  • Feeding capacity: 550-sheet standard tray
  • Compatible supplies: C625 Series
  • Recommended use: Corporate office
  • Official drivers / firmware

Steps to follow

  1. 1

    Restart services

    Power off the device, wait 30 seconds, and restart to clear pending jobs.

  2. 2

    Check IP

    Access the panel and ensure the IP is static and conflict-free.

  3. 3

    Check credentials

    Verify that your SMTP or SMB credentials have not expired.

Frequently asked questions

This error occurs due to a network authentication failure when the printer attempts to access an SMB/SMTP server.

It is not a hardware failure, but it blocks scanning and network printing until permissions are corrected.

It uses the C625 series high-capacity cartridges with EA Eco technology.

Keep your firmware updated and periodically audit your network DNS and authentication settings.

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