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Firewalls is very useful things for internet security problems for data transmission or other purpose but some times firewalls have some problems which are discussed in this research paper. Software firewalls that only block inwards traffic such as the Windows XP default firewall are useless at detecting programs on one system that are trying to communicate without one knowledge. Configuring a firewall can be difficult if one want maximum security and functionality. Software firewalls need to be enabled during the boot-up process just after network connections enabled and disabled just before the network connection is closed.
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