LogrobotLM

LogrobotLM — AI fault diagnosis for ABB · KUKA · FANUC robots. It reads your robot backup in your browser (never uploaded) and pinpoints the fault. Try it free →

FANUC Alarm HOST-284 — SMB: Secure Signature from PC failed

FANUC HOST-284 (“SMB: Secure Signature from PC failed”): The Secure Signature failed on a network message sent from the PC to the robot controller. First check: The PC server has message signing enabled.

Updated 2026-09-17 · LogrobotLM reference

Description

The Secure Signature failed on a network message sent from the PC to the robot controller.

Remedy

The PC server has message signing enabled. This forces the robot controller to perform Secure Signatures to verify communication integrity. If the problem persists, document the events that led to the error, and call your FANUC or FANUC Robotics technical representative.

Related codes

HOST-282SMB: No share configuredHOST-283SMB: Netbios configuration errorHOST-285SMB: DOS error: File not foundHOST-286SMB: DOS error: Path not found

Indicative field information — the robot manufacturer's manual and safety procedures always prevail. Never bypass a safety device; apply lockout/tagout (LOTO) before any physical intervention. How this reference is built →