Bot attacks - death to the bot

Jan 6 22:19:04 freenas sshd[53755]: Disconnected from invalid user unm 51.77.140.111 port 38102 [preauth]
Jan 6 22:30:56 freenas sshd[54290]: Disconnected from invalid user zhz 34.66.28.207 port 34648 [preauth]
Jan 6 22:54:28 freenas sshd[54977]: Disconnected from invalid user nagios 218.78.54.84 port 46548 [preauth]
Jan 6 23:30:30 freenas sshd[56247]: Disconnected from invalid user pondering 59.51.65.17...

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