This paper does not cover procedures for securing a machine that is already on a network. As a rule, no machine should be placed on any network prior to its having been secured against local and remote attack. If a machine has already been compromised, none of the following procedures will improve the system's security. In most cases, depending on the skill of the intruder, the machine will likely already be trojaned or backdoored. Applying the following security procedures on such a machine would only provide a false sense of security.
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