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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