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Abstract
The services like SSH, Telnet, VNC etc which enables internet users or administrators to remotely connect and control a computer operating system with the aid of software or command line tools. To connect those services one must complete the authentication process. Attackers or Cyber criminals can crack those remote connection services using different methodologies. With help of Penetration testing tools like Hydra, Metasploit, Brutus etc weak passwords can easily compromised. In the following paper those services passwords are compromised and gain unauthorized access to user account of a computer.