This session will deal with proxy server, which is a program running on a computer that sits between a client computer and the Internet and provide indirect services to client. The different uses of a proxy server for network administrator as well as for hackers are discussed. The concept of using proxy servers for hiding foot prints of a cyber attack are discussed. Finally squid proxy server is installed and configured on Ubuntu Server machine and its different uses are shown on Kali Linux and Windows10 client machines.