SSH Fails for Active Directory Domain Users with Error "User not known to the underlying authentication module" (Doc ID 2290549.1)

Last updated on JULY 31, 2017

Applies to:

Linux OS - Version Oracle Linux 7.3 with Unbreakable Enterprise Kerne [4.1.12] and later
Linux x86-64

Symptoms

Following errors are observed for Active Directory Domain users when trying to ssh.

login as: test1
test1@10.x.x.x's password:
Access denied

The /var/log/secure shows the following error.

Jul 26 20:42:00 adclient sshd[7988]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=dhcp-xxx user=test1
Jul 26 20:42:00 adclient sshd[7988]: pam_sss(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=dhcp-xxx user=test1
Jul 26 20:42:00 adclient sshd[7988]: pam_sss(sshd:auth): received for user test1: 10 (User not known to the underlying authentication module)

Cause

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