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Unable to login because of a ESXi root account lockout ...

    https://www.ivobeerens.nl/2018/01/02/esxi-root-account-locked/
    02/01/2018 · pam_tally2 --user root --reset After this command I was able to login the vSphere Host Client. In the vSphere Host Client I found the VM that is causing the root account lockout: The VM was monitoring the vSphere ESXi host with the wrong root password. After changing the password the account lockout problem was solved.
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    https://www.ivobeerens.nl/2018/01/02/esxi-root-account-locked/

pam_securetty: Limit root login to special devices - Linux ...

    https://www.systutorials.com/docs/linux/man/8-pam_securetty/
    pam_securetty - Limit root login to special devices SYNOPSIS pam_securetty.so [debug] DESCRIPTION pam_securetty is a PAM module that allows root logins only if the user is logging in on a "secure" tty, as defined by the listing in /etc/securetty. pam_securetty also checks to make sure that /etc/securetty is a plain file and not world writable.
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    https://www.systutorials.com/docs/linux/man/8-pam_securetty/

Configure And Use Linux-PAM - Like Geeks

    https://likegeeks.com/linux-pam-easy-guide/
    11/03/2017 · Learn about Linux-PAM or Pluggable Authentication Modules, Configuration, Management Groups, Control Flags, PAM Modules, pam_nologin and more Modules ... There are many programs on your system that use PAM modules like su, passwd, ssh, login, and other services. We will discuss some of them. ... pam_nologin module. This module allows root only ...
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    https://likegeeks.com/linux-pam-easy-guide/

linux - How to enable pam and disallow root/password login ...

    https://serverfault.com/questions/1024863/how-to-enable-pam-and-disallow-root-password-login-for-ssh
    ChallengeResponseAuthentication no PasswordAuthentication no UsePAM no PermitRootLogin no But now I want to be able to receive email notifications if someone logs in via ssh. For that I added the following line to /etc/pam.d/sshd: session optional pam_exec.so seteuid /usr/local/bin/login-notify.sh To make this work I need to set UsePam to yes.
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    https://serverfault.com/questions/1024863/how-to-enable-pam-and-disallow-root-password-login-for-ssh

How Can I Log In As root User? - nixCraft

    https://www.cyberciti.biz/faq/how-can-i-log-in-as-root/
    15/10/2021 · Remote root login over the ssh session. You can use the ssh client as follows: $ ssh [email protected] $ ssh [email protected] $ ssh [email protected] However, remote root login over ssh session is disabled in most cases for security reasons. First, login as a normal user and then switch to root account using the su command:
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    https://www.cyberciti.biz/faq/how-can-i-log-in-as-root/

Linux PAM configuration that allows or deny login via the ...

    https://www.cyberciti.biz/tips/linux-pam-configuration-that-allows-or-deny-login-via-the-sshd-server.html
    Wrong configuration can lock down all login access including root access. Read this Linux-PAM configuration file syntax guide Now continue reading below for pam_listfile.so configration… Use of pam_listfile.so module This PAM module authenticates users based on the contents of a specified file.
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Linux login command help and examples - Computer Hope

    https://www.computerhope.com/unix/ulogin.htm
    13/03/2021 · LOGIN_RETRIES: number: Maximum number of login retries in case of bad password. This will most likely be overridden by PAM since the default pam_unix module has its own built-in of 3 retries. However, this is a safe fallback in case you are using an authentication module that does not enforce PAM_MAXTRIES. LOGIN_TIMEOUT: number: Max time in ...
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    https://www.computerhope.com/unix/ulogin.htm

6.28. pam_securetty - limit root login to special devices

    http://linux-pam.org/Linux-PAM-html/sag-pam_securetty.html
    6.28.1. DESCRIPTION pam_securetty is a PAM module that allows root logins only if the user is logging in on a "secure" tty, as defined by the listing in the securetty file. pam_securetty checks at first, if /etc/securetty exists.
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    http://linux-pam.org/Linux-PAM-html/sag-pam_securetty.html

10.2. PAM 設定ファイルについて Red Hat Enterprise Linux 7 | Red …

    https://access.redhat.com/documentation/ja-jp/red_hat_enterprise_linux/7/html/system-level_authentication_guide/pam_configuration_files
    [root@MyServer ~]# cat /etc/pam.d/setup auth sufficient pam_rootok.so auth include system-auth account required pam_permit.so session required pam_permit.so auth sufficient pam_rootok.so : この行は、UID が 0 であることを確認し、 pam_rootok.so モジュールを使用して、現在のユーザーが root かどうかを確認し ...
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    https://access.redhat.com/documentation/ja-jp/red_hat_enterprise_linux/7/html/system-level_authentication_guide/pam_configuration_files

linux - PiDora PAM allows root login but sometimes deny it ...

    https://stackoverflow.com/questions/24834189/pidora-pam-allows-root-login-but-sometimes-deny-it
    PiDora PAM allows root login but sometimes deny it. Ask Question Asked 7 years, 8 months ago. Modified 5 years, 2 months ago. Viewed 339 times 0 0. I am working on the Raspberry Pi version of Fedora. I have to login on my device as root using sshd which works out of the box. Sometimes (very rarely), I can't login at all and my only option is to ...
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    https://stackoverflow.com/questions/24834189/pidora-pam-allows-root-login-but-sometimes-deny-it

How to Change the MySQL root Password | strongDM

    https://www.strongdm.com/blog/how-to-change-the-mysql-root-password
    14/04/2022 · On an unmodified MySQL install, the root user account does not have a password. This is extremely insecure! ‍ As a systems administrator, we know that the easiest way to compromise a system is using the default unchanged password with admin privileges. To set the root password for the root account: {{code}} $ mysql -u root --skip-password ...
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    https://www.strongdm.com/blog/how-to-change-the-mysql-root-password

How to Configure and Use PAM in Linux - Tecmint

    https://www.tecmint.com/configure-pam-in-centos-ubuntu-linux/
    Here, we want to disable root user access to a system, by restricting access to login and sshd services. We can use the /lib/security/pam_listfile.so module which offers great flexibility in limiting the privileges of specific accounts. Open and edit the file for the target service in the /etc/pam.d/ directory as shown.
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    https://www.tecmint.com/configure-pam-in-centos-ubuntu-linux/

How to allow only specific non-root user(s) to use crontab ...

    https://www.thegeekdiary.com/how-to-allow-only-specific-non-root-users-to-use-crontab/
    How to allow only specific non-root user(s) to use crontab. by admin. From the manpage of crontab command: If the cron.allow file exists, then you must be listed therein in order to be allowed to use this command. If the cron.allow file does not exist but the cron.deny file does exist, then you must not be listed in the cron.deny file in order ...
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    https://www.thegeekdiary.com/how-to-allow-only-specific-non-root-users-to-use-crontab/

4 Ways to Disable Root Account in Linux - Tecmint

    https://www.tecmint.com/disable-root-login-in-linux/
    In this case, we want to disable root user access to a system, by restricting access to login and sshd services. First open and edit the file for the target service in the /etc/pam.d/ directory as shown. $ sudo vim /etc/pam.d/login OR sudo vim /etc/pam.d/sshd Next, add the configuration below in both files.
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    https://www.tecmint.com/disable-root-login-in-linux/

Allow root access via PAM - LinuxQuestions.org

    https://www.linuxquestions.org/questions/fedora-35/allow-root-access-via-pam-705185/
    + : root : 10.0.0.254 + : root : 127.0.0.1 - : root : ALL Finally, # vim /etc/pam.d/sshd I appended the following entry account required pam_access.so With the above config, I'm still getting "permission denied" when I try to login via ssh from 10.0.0.254 What did I miss?
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4.4.2. Disallowing Root Access Red Hat Enterprise Linux 4 ...

    https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/4/html/security_guide/s2-wstation-privileges-noroot
    To limit root access to a system service, edit the file for the target service in the /etc/pam.d/ directory and make sure the pam_listfile.so module is required for authentication. The following is an example of how the module is used for the vsftpd FTP server in the /etc/pam.d/vsftpd PAM configuration file (the \ character at the end of the ...
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    https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/4/html/security_guide/s2-wstation-privileges-noroot

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