Articles in the security category

Tightening UFW Firewall Rules to Limit SSH Access

The auth.log on one of my servers (really, on all of the servers I have access to) is full of stuff like this:

Dec  8 03:19:33 localhost sshd[4718]: User root from 10.1.2.3 not allowed [...]
Dec  8 03:19:35 localhost sshd[4721]: Invalid ...

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