Data Domain: iDRAC Web User Interface not available after DDOS upgrade - Connection failure to FQDN
Summary: With DD OS upgrade to the releases 7.10.1.15, 7.10.1.20, 7.11.0.0, 7.13.0.0 we move to iDRAC versions 6.x.x. The iDRAC user interface might not be accessible anymore and needs reconfiguration. ...
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Symptoms
The iDRAC Web User Interface might fail to load in the Web-Browser.
It reports connection issues like 'Unable to connect', 'Internal Server Error', or '400-Bad Request' errors.
It reports connection issues like 'Unable to connect', 'Internal Server Error', or '400-Bad Request' errors.
Cause
The "Host Header check" security feature ensures iDRAC access using IPv4/IPv6 address, RAC Name, or defined FQDN (DNSRacName.DNSDomainName).
Updating iDRAC firmware to version 6.xx or later changes the static 1Pv4 or 1Pv6 DNS settings.
The iDRAC user interface might not be accessible anymore; the HTTPS access to the webserver in iDRAC9 firmware through FQDN is blocked.
The following parameters are changed to default:
DNSDomainFromDHCP=Enabled
DNSDomainName=
DNSDomainNameFromDHCP=Enabled
From the iDRAC release note:
https://dl.dell.com/content/manual60830302-idrac9-version-5-10-50-00-release-notes.pdf?language=en-us
iDRAC firmware
1. Updating iDRAC firmware to version 6.xx or later changes the static 1Pv4 or 1Pv6 DNS settings. Ensure to reconfigure the network settings after the upgrade is complete.
Updating iDRAC firmware to version 6.xx or later changes the static 1Pv4 or 1Pv6 DNS settings.
The iDRAC user interface might not be accessible anymore; the HTTPS access to the webserver in iDRAC9 firmware through FQDN is blocked.
The following parameters are changed to default:
DNSDomainFromDHCP=Enabled
DNSDomainName=
DNSDomainNameFromDHCP=Enabled
From the iDRAC release note:
https://dl.dell.com/content/manual60830302-idrac9-version-5-10-50-00-release-notes.pdf?language=en-us
iDRAC firmware
1. Updating iDRAC firmware to version 6.xx or later changes the static 1Pv4 or 1Pv6 DNS settings. Ensure to reconfigure the network settings after the upgrade is complete.
Resolution
Use RACADM to connect and correct the DNS setting:
1. Disable 'HostHeaderCheck' if it is used.
racadm set idrac.webserver.HostHeaderCheck 0
2. Log in to the iDRAC user interface and re-configure the DNS setting
iDRAC Settings -> Connectivity tab -> Network -> Common Settings + 1Pv4 Settings /1Pv6 Settings
After making the changes, enable 'HostHeaderCheck' if re-enabling the check is wanted.
racadm set idrac.webserver.HostHeaderCheck 1
Test the access to the iDRAC WEB console again
Affected Products
Data Domain, iDRAC9 - 6.xx SeriesArticle Properties
Article Number: 000223272
Article Type: Solution
Last Modified: 24 Jul 2024
Version: 4
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