All too often, when business applications are decommissioned, they are not removed cleanly from the network and sent to the application graveyard; they’re simply left to fester. The rules and policies which those old applications relied on to work then quietly rot away on firewalls and other network devices. This isn’t just bad network hygiene: these old rules can introduce security vulnerabilities that lead to compliance violations or damaging breaches – which are truly frightening prospects - as well as compromise the performance of your firewalls. In honor of Halloween, lets take a closer look at why the horrors of rules left behind by dead applications continue to cause problems on enterprise networks, and how they can be exorcised, never to return.

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