OCI: Specific User is Unable to Login To Instance

Applies to

Oracle Cloud Infrastructure - Version N/A and later 

Linux x86-64 

Goal

This document outlines the steps required to recover from a failed login attempt for a specific user. 

Symptoms 

Unable to login to an instance via ssh for a specific user (user1), all other users are able to login with no issues. 

The following messages are seen in /var/log/secure and via systemctl 

# grep user1 /var/log/secure | tail 
Jun 27 10:23:54 hostname unix_chkpwd[27677]: could not obtain user info (user1) 
Jun 27 10:23:54 hostname sshd[27674]: fatal: Access denied for user user1 by PAM account configuration [preauth] 
Jun 27 10:24:09 hostname unix_chkpwd[27692]: could not obtain user info (user1) 
Jun 27 10:24:09 hostname sshd[27690]: fatal: Access denied for user user1 by PAM account configuration [preauth]