I have linux server running CentOS, Apache, mySQL.
I have an external Cisco firewall, and I currently connect to my server via SSH or Plesk 9.
I have recently reviewed several 'logwatch' emails sent to me from my server. The content of these emails is beginning to worry me. There are over a hundred unauthorized attempts at accessing my server with usernames anywhere from 'Bob' to 'madman86'. I am the ONLY person who even knows about my server, so I'm wondering if these are hacking attempts? If so, is this normal? Is this something I should worry about? What is the best safeguard against these 'attempts'?