By Rob Cameron, Chris Cantrell, Anne Hemni, Lisa Lorenzin
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Fortunately, anti-virus companies now respond within hours of a new outbreak. Since nearly all anti-virus software has auto-update features, the new definitions are usually quickly put in place and effectively shut down the proliferation. This does not mean you are immune from infection if you have anti-virus software, it just means you are generally safe from older viruses. , a bit of malicious code designed to “explode” under certain circumstances such as performing, or failing to perform an action).
This book is a good start to configure your firewall securely; however, don’t stop here. Read the manufacturer’s documentation, white papers provided by the manufacture, and blogs, newsgroups, and discussion groups related to your model of firewall. Learn from other’s mistakes and don’t make them yourself. Most of these resources are freely available on the Web; a few searches should turn up starting points that will lead you to more resources. To a determined hacker, discovering a firewall is tantamount to throwing down a gauntlet and posing the challenge of how to exploit the permitted access.
Limited Control, Depending on Vendor While some application proxies can be tweaked, others cannot. In most cases, if you are using standard protocols and the application proxy at your border to the Internet, it will not matter if you can finely control what does and doesn’t enter your protected network. However, using an application proxy to protect an entire server room from the rest of the organization can prove to be disastrous if not tested. Note that neither of these scenarios are typical uses for an application proxy.