Finding failed SSH login attempts on Debian Systems, Ubuntu, Centos

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The following tutorial describes how to list all invalid ssh logins.
We will do everything by executing one command!

To view invalid logins in Debian / Ubuntu systems issue the command:

1
grep "Failed password" /var/log/auth.log

In the Centos system

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grep "Failed" /var/log/secure

We will get the results as in the screenshot.

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