sc681-01IM C7500

Error SC681-01 Ricoh IM C7500: Authentication Failure

The Ricoh IM C7500 error SC681-01 signals a communication failure when the device attempts a user authentication request over the network (e.g., LDAP or Kerberos server). When the machine receives no response from the server, it blocks access to protect the corporate environment. This often happens after server security policy changes.

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Common causes

  • 1LDAP or Kerberos server unreachable or down.
  • 2Date/time desynchronization between the printer and domain.
  • 3Expired or incorrect service account credentials.
  • 4Firewall blockage on the server communication port.

Solutions

Diagnostic

If the device has started showing SC681-01, check if other network services, such as the Web Image Monitor, are accessible. If the web page loads, the issue is specific to authentication protocols.

Step-by-step Solution

  1. Verify the Ethernet cable is connected and the authentication server IP is reachable from another PC on the same network.
  2. Access the Web Image Monitor using a local administrator account.
  3. Re-validate access credentials for the Active Directory or LDAP server.
  4. Sync the printer's date and time with the network server, as a mismatch over 5 minutes triggers authentication errors.

Maintenance

Keep the system time synced with an NTP server. Conduct connectivity tests before applying password changes for directory services.

When to call a technician

If network settings and credentials are correct, a technician should verify the internal network module configuration to ensure no firewall restrictions exist.

Technical Data

  • Technology: Color multifunction printer
  • Speed: 75 ppm
  • Connectivity: Ethernet 1000Base-T
  • Capacity: High corporate load
  • Consumable: IMC7500 series toner
  • Use: Intensive production
  • Official Drivers / firmware

Steps to follow

  1. 1

    Check network

    Confirm the network cable is connected and the switch is active.

  2. 2

    Server settings

    Review LDAP or authentication server credentials in the web interface.

  3. 3

    Reset

    Restart the network configuration via the touchscreen panel.

Frequently asked questions

This error means the printer cannot communicate with the authentication server to validate users.

It blocks access to the device if mandatory authentication is enabled.

None; it is a software/network configuration error.

Ensure the server time and printer time are synchronized.