Who, Me? Welcome to another instalment of Who, Me? It's The Register 's reader-contributed column that shares your missives about massive mistakes, and how you managed to move on after them.

This week, meet a reader who asked to be Regomized as "FireBug," a name that makes sense because the story he sent concerns a firewall he worked on during his time as part of a small team that managed a global company's security and VPN infrastructure.

"I had just passed my CCNA and CCNE certifications when I received a request to make a major update to the firewall rulebase," FireBug told Who, Me?

As a sensible fellow, FireBug had a three-stage process for such requests.

First, he would read firewall rules to check for obvious errors. Next, he would deploy them in an isolated test environment. If

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