If you use the faillog -a command and get output like that shown below listing 12/31/69 as in the time columns, it’s clear this file is not in use. You might check out the faillog command, but this command looks at the /var/log/faillog file which does not seem to be used on many systems these days. Adding lines like these will enforce your settings. $ sudo grep "Failed password" /var/log/auth.log | grep -v COMMAND | awk '' | sort | uniq -cĬheck settings in the /etc/pam.d/password-auth and /etc/pam.d/system-auth files. You could summarize instances of failed logins by account with a command like this: Nov 17 15:09:13 localhost sshd: Failed password for nemo from 192.168.0.7 port 8132 ssh2 Nov 17 15:08:39 localhost sshd: Failed password for nemo from 192.168.0.7 port 8132 ssh2 When someone tries logging in with a wrong or misspelled password, failed logins will show up as in the lines below: $ sudo grep "Failed password" /var/log/auth.log | head -3 The command below looks for indications of failed logins in the /var/log/auth.log file used on Ubuntu and related systems. One of the first things you need to know is how to check if logins are failing. In this post, we look at how you can check for failed login attempts and check your system's settings to see when accounts will be locked to deal with the problem. Repeated failed login attempts on a Linux server can indicate that someone is trying to break into an account or might only mean that someone forgot their password or is mistyping it.
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