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POWER based HMC, BMC password limits to 19 characters

  • 1.  POWER based HMC, BMC password limits to 19 characters

    Posted Wed February 24, 2021 09:06 AM
    I recently encountered a problem where the new POWER based HMC appliance silently truncates long passwords when changing passwords in the BMC interface. We were locked out after entering a secure long password. We expected that if the password was too long, that we would truncate it and update it in our password manager. The BMC silently allowed the long password with no errors, but subsequent logins failed. We had to reset the password via IPMITOOL as root on the HMC. It was later confirmed in the BMC web UI HTML form source that it can't take more than 19 characters.

    Until the documentation is improved, everyone should be aware that BMC/IPMI passwords are truncated at 19 characters long. Extra characters are silently discarded and could result in login failures.

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    Russell Adams
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