Firewalls

Firewalls

A firewall is a security system consisting of a combination of hardware and software that limits unauthorized users from gaining access to a computer network. Originally, firewalls were meant to support and improve online work, not block progress or productivity. Firewalls are frequently used to prevent access to private computer networks (intranets). In this way, sensitive information cannot be accessed and used for devious purposes (e.g., keeps the jerks out of the network so you can do your job).  

Firewalls are also used to filter email for spam and other unwanted content. All messages entering and leaving the firewall are examined and blocked if they do not meet specified security criteria.

Firewalls are currently utilized by most government agencies, as a means to enhance security. Additionally, they are commonly used by local area networks to restrict access to certain content on the internet. Unfortunately, firewalls are often applied broadly, even where specific mis-use has not been established. In this aspect, they can be viewed as an inappropriate filter, verging on censorship. Contact your IT administrator if you find that you need to access internet tools that are blocked by a firewall. Information in this document can help you explain the need and provide justification for how a tool or application will be used to benefit your agency or organization's mission.

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