016-781WorkCentre 3655i

Xerox WorkCentre 3655i error 016-781: Authentication Failure

The Xerox WorkCentre 3655i error 016-781 is a common failure occurring during scan-to-email, indicating an authentication handshake failure with the SMTP server. When asking why does my Xerox WorkCentre 3655i show 016-781?, focus on updating your SMTP credentials and encryption settings.

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Common causes

  • 1Expired SMTP credentials.
  • 2Encryption protocol mismatch (SSL/TLS).
  • 3SMTP server block.
  • 4Incorrect server port.

Solutions

Diagnóstico rápido

016-781 means the mail server rejected the printer. Check if your mail password or security protocol has recently changed.

Solución paso a paso

  1. Log-in: Access the printer's Web UI.
  2. SMTP: Navigate to Email/SMTP settings.
  3. Credentials: Re-enter user/password.
  4. Security: Confirm SSL/TLS settings.

Prevención y mantenimiento

Use specific service accounts for scan-to-email to avoid password expiry issues.

Cuándo llamar a un técnico

If the server remains inaccessible despite correct credentials, contact your network/email administrator.

Ficha técnica del equipo

  • Technology: Multifunction Laser
  • Speed: 47 ppm
  • Connectivity: Ethernet
  • Consumibles: 106R02723 toner
  • Usage: Corporate
  • Official drivers / firmware