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Understanding the Keyboard Controller Style (KCS) Policy Message in the Integrated Baseboard Management Controller (Integrated BMC) Web Console

Content Type: Product Information & Documentation   |   Article ID: 000058321   |   Last Reviewed: 05/28/2026
Description Resolution Additional information

Environment

 

Description

Explains the KCS (Keyboard Controller Style) Policy Control Mode settings in the BMC Web Console including the meaning of each option and guidance on selecting the appropriate setting for a given environment

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Resolution

The KCS Policy Control Modes determine how the BMC handles IPMI commands from the host operating system. These settings balance security with functionality for server management applications.

The Keyboard Controller Style (KCS) Policy Control Modes allow an authenticated BMC administrative user to control the level of protection from IPMI commands executed over the KCS channels. Within this generation of BMC firmware, 3 different KCS Policy Control Modes are supported:

  • Allow All: This configuration setting is intended for normal IPMI compliant communications between the Host OS and the BMC. This mode should be used when provisioning the BMC configuration for deployment.
  • Deny All: This only applies to the IPMI commands over the KCS interfaces and does not apply to the authenticated network interfaces to the BMC. This configuration setting disables the IPMI KCS command interfaces between the Host OS and the BMC. This is a non-compliant IPMI configuration that will impact the operation of the Server Management Software running on the Host OS. This only applies to the IPMI commands over the KCS interfaces and does not apply to the authenticated network interfaces to the BMC.
  • Restricted: This configuration setting enables the use of an Access Control List by the BMC Firmware that allows applications executing on the host OS to have access to a limited set of IPMI commands using the KCS interfaces. This is a non-compliant IPMI configuration that may impact the operation of the Server Management Software running on the Host OS.

Additional information

More details about Integrated BMC can be found in Intel® Integrated Baseboard Management Controller Embedded Web Server User Guide.

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