I just checked the ssh connections logs, because my public bandwidth is unusually high and found this:
tcp ESTAB 0 1080 68.183.77.132:ssh 61.177.172.158:49833
tcp FIN-WAIT-1 0 1 68.183.77.132:ssh 222.186.180.223:22882
tcp ESTAB 0 36 68.183.77.132:ssh *MYIP*:61630
tcp ESTAB 0 1080 68.183.77.132:ssh 61.177.172.158:21058
tcp ESTAB 0 1080 68.183.77.132:ssh 218.92.0.248:47166
All of these except mine are chinese ips. I looked them up and they are all from the “Asia Pacific Network Information Centre”. Not sure what to do now with this information, but I don’t like it. Do I need to worry?
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Hi, @EMokro
You can block every IP address that makes unsuccessful ssh authentication as this is clearly not a legit traffic. You can install CSF (Config Server Firewall) and they will be automatically blocked and you can also set rules to block whole regions and countries.
You can also look into changing the ssh port and make only the pubkey authentication is enabled leaving the password authentication disabled in order to keep things safe. Also make sure everything on the droplet is updated and you’ve blocked/closed all the ports which are not used.
Brute force login attacks are one of the most common ways for a server to be compromised. This tutorial shows you how:
Hope that helps!
Regards, Alex