Ashraf Miah
May 19, 2022

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A very simple and effective defense mechanism to reduce the number of attacks (but won't stop a persistent attacker) is to use non-default ports.

Changing the SSH listen port from 22 to something in the 30XXX range can drop automated SSH login attempts by several magnitudes!

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Ashraf Miah

Data Scientist and Chartered Aeronautical Engineer (MEng CEng EUR ING MRAeS) with over 15 years experience in the Aerospace, Defence and Rail Industry.