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Internet network services have provided enormous benefits for the spread of information, consequently more and more users are accessing it through internet services [1]. Internet media provide many benefits for people who need according to their respective goals such as internet needs by server administration. In order for the server computer to be accessed from an unlimited distance, an internet media service with remote login service is needed for an administrator, so that the server computer access can be done elsewhere, the administrator needs to install a secure shell service (SSH). The concept of a problem in computer network services is caused by the type of computing or the security level of certain computer systems [2]. The level of security in internet services is also a priority, because internet-based information services are vulnerable to abuse by attackers who successfully log in to computer network systems[3]. The severity and number of attacks on the internet and on computer networks have increased rapidly over time. Most security solutions are concentrated on resisting attacks, but cannot eliminate other forms of attack [4]. Access services on this internet network can be done various activities such as uploading files to the server computer, then an administrator must also install the file server application on the server ARTICLE INFO A BST RA C T

Optimization Of Server Computer Security Using The Port Knoking Method On Ubuntu Server 12.04 LTS