400ES5433

OKI ES5433 Error 400: Scanning Troubleshooting

OKI ES5433 error 400 frequently appears during network scanning or digital document transmission. If you ask why does OKI ES5433 show error 400 when scanning?, the problem usually originates in shared folder permissions or unstable network configurations. This error restricts the scanning capabilities of your multifunction device.

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Common causes

  • 1Incorrect or unreachable network destination path (SMB/FTP).
  • 2Expired scan user credentials or missing write permissions.
  • 3Local IP address conflicts causing communication loss.
  • 4Destination server or PC turned off during scan attempt.

Solutions

Diagnóstico rápido

Error 400 usually indicates that a scan request was rejected by the server or that the network path is unreachable. If you can print but not scan, the issue is likely a configuration mismatch between the printer IP and the destination folder.

Solución paso a paso

  1. Check IP: Verify on the control panel that the printer IP matches the configuration on the PC.
  2. Restart Service: Unplug the network cable and reconnect it after a few seconds.
  3. Update Driver: Reinstall scanning drivers on the host computer.
  4. Verify Permissions: Confirm the destination folder has active write permissions.

Prevención y mantenimiento

Assign a static IP to the printer to prevent connection breaks. Clean the scanner glass frequently to prevent streaks and image processing errors.

Cuándo llamar a un técnico

If you have verified that network settings and credentials are correct and error 400 persists, the printer's network interface card (NIC) might be faulty.

Ficha técnica del equipo

  • Technology: LED with color scanning.
  • Speed/Performance: 40 ppm.
  • Connectivity: Gigabit Ethernet.
  • Feed Capacity: ADF available.
  • Compatible Consumables: ES5433 series toner.
  • Recommended Use: Small and medium office.
  • Official drivers / firmware

Steps to follow

  1. 1

    Check IP

    Verify on the control panel that the printer IP matches the configuration on the PC.

  2. 2

    Restart Service

    Unplug the network cable and reconnect it after a few seconds.

  3. 3

    Update Driver

    Reinstall scanning drivers on the host computer.

Frequently asked questions

This error occurs when the device cannot communicate correctly with the configured network destination for saving scanned documents.

It does not block printing, but it stops network scanning capabilities.

Use the printer's web interface by typing its IP address into any browser.

Regularly clean the exposure glass with a soft cloth without harsh chemicals.