Print | Rate this content

HP ProLiant Servers - Serial Port Is Not Working and Serial Devices Are Not Working Properly


Serial devices are not working if they are connected to the serial port of an HP ProLiant Server. The same device is connected to third-party Server (non HP), and it works perfectly.


By default, the serial port of HP ProLiant Servers is occupied by the Integrated Lights-Out (iLO) and the Remote access through the serial port.

If a serial device needs to be connected, the remote access through the serial port needs to be disabled from the iLO, and from the ROM Based Setup Utility (RBSU).

From the iLO settings, there is an option for the Command Line Interface (CLI) settings. Disable the Serial CLI Status (as shown in the following illustration).

From the RBSU, the BIOS Serial Console Port needs to be disabled, as shown in the illustration that follows. (Select BIOS Serial Console & EMS, then select BIOS Serial Console Port, and then select Disabled).

NOTE: The BIOS Serial Console enables the serial port to be configured to view Power-On Self-Test (POST) error messages, and to run RBSU remotely through a serial connection to the server COM port. It does not need to be enabled for the server to work properly, and it needs to be disabled to enable the serial port for any other device.

Legal Disclaimer: Products sold prior to the November 1, 2015 separation of Hewlett-Packard Company into Hewlett Packard Enterprise Company and HP Inc. may have older product names and model numbers that differ from current models.

Provide feedback

Please rate the information on this page to help us improve our content. Thank you!
Document title: HP ProLiant Servers - Serial Port Is Not Working and Serial Devices Are Not Working Properly
Document ID: emr_na-c01139344-23
How helpful was this document?
How can we improve this document?
Note: Only English language comments can be accepted at this time.
Please wait while we process your request.