Modbus_Exception.Negative.Acknowledge

description-logo Description

This indicates detection of the Modbus Negative Acknowledge Exception command.
MODBUS is an application-layer messaging protocol, positioned at level 7 of the OSI model. It provides client/server communication between devices connected on different types of buses or networks.

affected-products-logoAffected Products

Modbus protocol

Impact logoImpact

Unexpected network communication

Technology

Browser-Based, Network-Protocol, Client-Server, Peer-to-Peer, Cloud-Based, Mobile-Device

Behavior

  • Reasonable

Application Dependencies

Default Ports

  • TCP/502