Defense system against interference when the activity is generally done
manually by the administrator. This resulted in the integrity of the system depends
on the availability and speed of the administrator in response to disturbance. In
the current era of information technology, almost all information is important for
an institution can be accessed by its users. Disclosure of such access raises new
security issues in part of a computer network system that is very important to
maintain the validity and integrity of data and ensure availability of services for
In this issue then designed a system to detect any interference. The
detection is based filtering on the port service, using the programming language
Delphi 7. The data obtained from the filtered traffic data packets passing the
proxy server. By building a system that can work automatically and in real time,
then perform the detection of intruders or illegal activities which will then be
reported to the administrator.
With this administrator can find out the use of illegal ports through port
filter techniques on the traffic data service in and out in real time, from both
internal and external networks. Administrators can do the monitoring without
having to depend on availability. With such a system administrator can perform
tasks more efficiently in maintaining the validity and integrity of data.
Key words: security threats, Internet Proxy Server, SMS.