What are some malicious visitor activities and what are some typical benign web crawler activities? I recognize some ZmEu access, /HNAP1, some shell commands.I also see an access from hello world (instead of Mozilla/5.0 etc). I think most of these are malicious or just poking around. What are some common security issues, and what are some preventive measures I can take to address them heads on, other than banning ip addresses? I also see some access to some .php, .index.php.bak, .asp, .jsp, that I did not upload or that is not part of public-html. How concerned should I be?