cPanel logs are very helpful to track the activities happening on the server. These activities are logged in different log files which can be then reviewed for problems occurred on the server.
HTTPoxy is a vulnerability with CGI environments, that allows an attacker to re-direct web traffic through an arbitrary proxy server.
suPHP and FastCGI require files and folders to have a specific set of permissions/ownership different from other handlers. Without these permissions set correctly you will see a lot of errors such as: “403 Forbidden”, “500 Internal Server Error”, or simply generic errors that commonly have the word ‘permission’ in them.