Introduction Fail2Ban is a security tool that helps protect Linux servers from repeated authentication failures and brute-force attacks. When running an Exim mail server, you can configure Fail2Ban […]
Introduction CodeIgniter uses the base_url configuration to generate URLs for resources such as links, stylesheets, JavaScript files, and other application assets. In some cases, the application’s URL may
Introduction A sidebar menu that doesn’t visually highlight the current page leaves users guessing where they are in your app. This guide shows how to make a sidebar
Introduction Checkboxes are a common form element, but detecting whether one is checked or unchecked in real time — and reacting to that change — trips up a
Introduction Installing system updates is important for keeping a CentOS server secure and up to date. However, in some situations, a newly installed package or update may cause
Introduction Server security is one of the most important aspects of system administration. Attackers frequently attempt to gain unauthorized access through services such as SSH, IMAP, POP3, and
