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Server admins commonly use SSH to log in to Linux servers. They will disable login via password due to the ease of brute force attacks these days. It is also good to set up SSH notifications with IP geolocation for better security. Getting an immediate notification when someone logs in is beneficial from a security viewpoint. It increases the chance that you can prevent an authorized party from doing real damage to your server. A fast response to intrusion will give the bad actor no chance to steal your data.