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FANUC Alarm HOST-287 — SMB: DOS error: Too many open files

FANUC HOST-287 (“SMB: DOS error: Too many open files”): The PC server was unable to open the requested file, because the robot controller has too many files opened to the remote PC. First check: Close some files that the robot controller has opened on the PC Share client tag associated with the remote PC.

Updated 2026-09-17 · LogrobotLM reference

Description

The PC server was unable to open the requested file, because the robot controller has too many files opened to the remote PC.

Remedy

Close some files that the robot controller has opened on the PC Share client tag associated with the remote PC. If the problem persists, document the events that led to the error, and call your FANUC or FANUC Robotics technical representative.

Related codes

HOST-285SMB: DOS error: File not foundHOST-286SMB: DOS error: Path not foundHOST-288SMB: DOS error: Access deniedHOST-289SMB: DOS error: Requested share does not exist

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 →