Article Number: 000189996
The Dell EMC Integrated Dell Remote Access Controller 8 (iDRAC8) firmware version 2.81.81.81 introduced HTTP or HTTPS connection changes that may impact user connections when specifying Fully Qualified Domain Name (FQDN) address. Due to these changes, iDRAC9 users may encounter connection errors, redirection, or '400 - Bad Request' errors. These connection sightings occur when the specified FQDN does not match the iDRAC 'DNSRacName' or 'DNSDomainName' values.
Browser Error Example:
root@rhel7-vm:~$ curl -k https://iR630-A.dell.com/
<!DOCTYPE html>
<head>
<title>Bad Request</title>
<link rel="shortcut icon" href="data:image/x-icon;," type="image/x-icon">
</head>
<body>
<h2>Access Error: 400 -- Bad Request</h2>
<pre></pre>
</body>
</html>
By default, iDRAC8 checks the HTTP or HTTPS Host Header and compares it to the defined 'DNSRacName' and 'DNSDomainName'. When the values do not match, the iDRAC refuses the HTTP or HTTPS connection. In iDRAC8 2.81.81.81, this Host Header enforcement can be disabled with the following RACADM command:
#Disable host header check
racadm set idrac.webserver.HostHeaderCheck 0
# Add manual entry to allow list
racadm set idrac.webserver.ManualDNSEntry 192.168.20.30
racadm set idrac.webserver.ManualDNSentry 192.168.20.30,idrac.mydomain.com
This additional configuration is required in cases when:
iDRAC8 with Lifecycle Controller version 2.81.81.81
11 Jan 2022
11
Solution