Are you unable to connect to your cPanel based VPS server or dedicated server to send or receive email, log into cPanel or WHM, or make an FTP or SSH connection? Are you able to view your website in your browser? If not, and the connection simply times out, it's possible that your IP address has been blocked by the dedicated server’s firewall. Typically, this is the result of too many failed logins (through cPanel, SSH, FTP, email, etc.) in too short a period of time.