Failed User Login

Linux Ubuntu

Flynn Weeks

Flynn Weeks

February 4, 2022

Enabled by default

Service: syslog

Log type: auth.log

Failed user logins can show possible password spray and password guessing attacks. Not every failed login is an attack, but they can be early indicators of one. This log is required by the PCI DSS regulation.

Linux calls this log authentication failure. To view this log in the GNOME logs viewer, search in the security tab for authentication or failure.

In order to view this log from the command line, enter the command grep failure /var/log/auth.log. If there are other failures in the auth.log, replace failure in the command with “authentication failure”.

View Logs
grep failure /var/log/auth.log
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Language: bash
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