We run a network of about 100 fortigates, last night we had an attempted SSH logon from 18.104.22.168 on about half of them. These all occured on 11/12 at exactly 6:14pm CT. We are trying to determine if we were targeted (but I have no idea how someone would get a hold of our IPs since there are no publicly accessible servers behind them) or if any other Fortigate sys admins noticed the same thing?
Now go drink a wheat beer and don't worry about it ;)
Seriously, brute-force attacks or ssh-login is nothing new. And as long as you have tcp.port22 open to the world, you will always seen failed logins. Why all your devices at at the same time, tells me it a admin of your network or somebody that was testing something and knows your addresses.
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