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 2026-08-29 · LogrobotLM reference
Description
The Secure Signature failed on a network message sent from the PC to the robot controller.
Remedy · Remède
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.
Frequently asked · Questions fréquentes
- What does FANUC alarm HOST-284 mean?
- 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.
- How do you troubleshoot FANUC alarm HOST-284?
- 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 / Codes liés
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. · Informations indicatives issues du terrain — le manuel du constructeur et ses procédures de sécurité font foi. Ne shuntez jamais un organe de sécurité ; consignez (LOTO) avant toute intervention physique. How this reference is built →