Oracle Linux: Server Added Back to AD after OS Upgrade but Authentication not Working Error: "pam_faillock(sshd:auth): User unknown:<AD_user>" (Doc ID 3073733.1)

Last updated on MARCH 28, 2025

Applies to:

Linux OS - Version Oracle Linux 8.0 and later
Linux x86-64

Server upgraded to OL8 and rejoined to Active Directory but authentication not working for AD users.

Errors in /var/log/secure shows:

Server upgraded to OL8.

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In this Document

Symptoms

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