PAM: On Debian systems the PAM modules run as the same user as the calling program, so they cannot do anything you could not do yourself, and in particular cannot access /etc/shadow unless the user is in group shadow. - If you want to use /etc/shadow for Exim's SMTP AUTH you will need to run exim as group shadow.
If you cannot recover access to the console, this could indicate issues with the file system used for authentication or configuration issues within the PAM subsystem. This would also impact attempts to reset the root password and log in through the console. @Jakuje, Jul 6 13:44:37 node2 sshd[23303]: pam_listfile(sshd:auth): Refused user user1 for service sshd Jul 6 13:44:39 node2 sshd[23294]: error: PAM: Authentication failure for user1 from node1. Seems like pam_listfile have some list of barred users – Yuriy Jul 6 '15 at 10:47 Jun 24 12:40:01 server1 crond[26129]: (admin) PAM ERROR (Authentication information cannot be recovered) Jun 24 12:40:01 server1 crond[26129]: (admin) FAILED to authorize user with PAM (Authentication information cannot be recovered) Jun 24 12:40:01 server1 crond[26130]: (admin) PAM ERROR (Authentication information cannot be recovered) Jun 24 The pam authentication plugin allows MariaDB to offload user authentication to the system's Pluggable Authentication Module (PAM) framework. PAM is an authentication framework used by Linux, FreeBSD, Solaris, and other Unix-like operating systems. PAM_DISALLOW_NULL_AUTHTOK Return PAM_AUTH_ERR if the database of authentication tokens for this authentication mechanism has a NULL entry for the user. Without this flag, such a NULL token will lead to a success without the user being prompted. Browse other questions tagged samba authentication pam active-directory or ask your own question. The Overflow Blog How Stack Overflow hires engineers
How to Troubleshoot PAM Configuration Errors - Managing
Jun 24 12:40:01 server1 crond[26129]: (admin) PAM ERROR (Authentication information cannot be recovered) Jun 24 12:40:01 server1 crond[26129]: (admin) FAILED to authorize user with PAM (Authentication information cannot be recovered) Jun 24 12:40:01 server1 crond[26130]: (admin) PAM ERROR (Authentication information cannot be recovered) Jun 24 The pam authentication plugin allows MariaDB to offload user authentication to the system's Pluggable Authentication Module (PAM) framework. PAM is an authentication framework used by Linux, FreeBSD, Solaris, and other Unix-like operating systems.
The default pam configuration tries to authenticate a user using pam_unix first, then using pam_ldap.so module if authentication with pam_unix is failed. If pam can't authenticate a user using pam_unix.so, it logs a message of auth failure and passes control to pam_ldap.so which authenticates the user successfully.
Jan 25, 2017 PAM: Authentication failure, with valid password - Unix PAM: On Debian systems the PAM modules run as the same user as the calling program, so they cannot do anything you could not do yourself, and in particular cannot access /etc/shadow unless the user is in group shadow. - If you want to use /etc/shadow for Exim's SMTP …