iDRAC9: HostHeaderCheck disabled after firmware update

Summary: The Dell Integrated Dell Remote Access Controller 9 (iDRAC9) firmware version 5.10.10.00 and 5.10.30.00 have the incorrect default value for idrac.webserver.HostHeaderCheck.

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Symptoms

The Dell Integrated Dell Remote Access Controller 9 (iDRAC9) introduced a new attribute idrac.webserver.HostHeaderCheck with a default value of "Enabled" in firmware 5.10.00.00.

$ racadm getsysinfo | grep -i firmware
Firmware Version        = 5.10.00.00
Firmware Build          = 57
Last Firmware Update    = 01/07/2022 14:34:07

$ racadm help idrac.webserver.hostheadercheck
Security Alert: Certificate is invalid - self signed certificate
Continuing execution. Use -S option for racadm to stop execution on certificate-related errors.
HostHeaderCheck           -- Enable HTTP Host Header Validation              
Usage                     -- 0-Disabled; 1-Enabled; Default - 1
Required License          -- RACADM
Dependency                -- None
 After upgrading to 5.10.10.00 or 5.10.30.00 firmware, the idrac.webserver.HostHeaderCheck default value is "Disabled." 
$ racadm getsysinfo | grep -i firmware
Firmware Version = 5.10.10.00
Firmware Build = 26
Last Firmware Update = 04/28/2022 16:49:23
$ racadm help idrac.webserver.hostheadercheck
Security Alert: Certificate is invalid - self signed certificate
Continuing execution. Use -S option for racadm to stop execution on certificate-related errors.
HostHeaderCheck -- Enable HTTP Host Header Validation
Usage -- 0-Disabled; 1-Enabled; Default - 0
Required License -- RACADM
Dependency – None

Cause

The default of "enabled" did not merge into the firmware updates beyond 5.10.00.00.

Resolution

HostHeaderCheck can be enabled on impacted firmware versions 5.10.10.00 and 5.10.30.00 using RACADM. 

$ racadm set idrac.webserver.hostheadercheck 1
Dell has corrected the attribute default to "Enabled" in iDRAC9 firmware 5.10.50.00 and later releases.

Affected Products

iDRAC9 - 5.xx Series
Article Properties
Article Number: 000199426
Article Type: Solution
Last Modified: 14 May 2026
Version:  4
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