Debian - See all failed/successful SSH login attempts
| #As root or via sudo, type this to see all failed login attempts | |
| cat /var/log/auth.log | grep 'sshd.*Invalid' | |
| #If you want to see successful logins, type this | |
| cat /var/log/auth.log | grep 'sshd.*opened' | |
| #View all failed login attempts in real-time | |
| tail -f /var/log/auth.log | grep 'sshd.*Invalid' |
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