003-750versalink-c405n

Xerox VersaLink C405n Error 003-750: LDAP Fix

The Xerox VersaLink C405n error 003-750 is a technical warning stating the device failed to reach an LDAP or directory server. This lockout keeps users from signing in to release their print jobs or scan to network. Knowing why my Xerox shows error 003-750 is essential to troubleshooting your directory connectivity.

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Common causes

  • 1LDAP Connectivity Loss: Server is down or unreachable.
  • 2Invalid Credentials: Service account passwords expired.
  • 3Port Blocking: Network firewall blocking required ports.
  • 4Time Mismatch: Clock drift between the server and the printer causing authentication failure.

Solutions

Diagnóstico rápido

The error appears when attempting an account-based action like searching the address book. If other devices can reach the LDAP server, the printer's specific network settings are likely at fault.

Solución paso a paso

  1. Check LDAP URL: Confirm the server address and port (e.g., 389 or 636) are correct.
  2. Validate account: Ensure the service credentials are current and not locked out on the server.
  3. Network Ping: Check connectivity to the LDAP server from a PC on the same network.
  4. Web UI config: Navigate to the web panel and save the authentication parameters again.

Prevención y mantenimiento

Set up network monitoring for your LDAP server and sync the printer's date/time via NTP.

Cuándo llamar a un técnico

If the server is proven accessible but the printer remains locked, the device's internal authentication module might need a technician's inspection.

Ficha técnica del equipo

  • Technology: Color Laser Multifunction
  • Performance: 45 ppm
  • Connectivity: Ethernet, Wi-Fi
  • Feed Capacity: 700+ sheets
  • Compatible Consumables: VersaLink C405 Toner
  • Recommended Use: Enterprise Office
  • Official Drivers / firmware

Frequently asked questions

This error signifies the printer could not connect to the LDAP or directory server to authenticate a user.

First, verify your server URL and service account credentials via the web UI.

No, this is strictly a networking and directory authentication issue.

Ensure time synchronization between server and printer, and stabilize network.