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Unable to login to Plesk via SSH with root user after deleting Imunify360

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Anastasia Zyrianova
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Plesk for Linux kb: technical

Applicable to:

  • Plesk for Linux

Symptoms

  • Unable to connect to Plesk server via SSH with root user:

    CONFIG_TEXT: Access denied
    Permission denied

  • The following error can be found in /var/log/messages (e.g. when connected not as root):

    CONFIG_TEXT: hostname crond[30531]: PAM unable to dlopen(/usr/lib64/security/pam_imunify.so): /usr/lib64/security/pam_imunify.so: cannot open shared object file: No such file or directory

  • Plesk notifications may not be sent after the execution of a Daily Maintenance task.

  • Cron tasks are not executed at the required time. In the /var/log/cron log file the following errors may persist:

    CONFIG_TEXT: crond[28816]: (root) PAM ERROR (Module is unknown)
    crond[28816]: (root) FAILED to authorize user with PAM (Module is unknown)

Cause

The Imunify360 extension has been recently deleted from the server, however, its leftovers are still present in the /etc/pam.d/system-auth and /etc/pam.d/password-auth configuration files.

Resolution

  1. Log in to Plesk.

  2. Install SSH Terminal extension and login to the server.

  3. Comment out corresponding lines in /etc/pam.d/system-auth and /etc/pam.d/password-auth as follows, e.g. using Vi:

    CONFIG_TEXT: #%PAM-1.0
    ...
    #auth required pam_imunify.so check_only
    ...
    #auth required pam_imunify.so
    ...

Comments

4 comments

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  • Avatar
    Alan Gonzales 
    I get this problem and so far I can't login with root
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    Anastasia Zyrianova

    Hello Alan Gonzales,

    Please apply the solution from the article and comment out the required lines in the /etc/pam.d/system-auth and /etc/pam.d/password-auth files via the SSH Terminal extension.

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  • Avatar
    Alan Gonzales

    Hi, 

    I'm missing an extra step.
    vim /etc/ssh/sshd_config

    Line:
    Match user , comment line.

    i did this and it worked

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    Anastasia Zyrianova

    Hello Alan Gonzales,

    Thank you for sharing. However, the `Match User` directive is not adjusted during the installation/removal of the Imunify360 extension. The solution described in the article is complete and no additional actions are required in this case.

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