Single point of failure. That's the right term for talking about the mess in San Francisco, where last week the city government finally regained control of its backbone network. Terry Childs, the net admin jailed for locking down administrative access, turned over the passwords during a secret visit from Mayor Gavin Newsom.

Childs' lawyer said Childs hadn't divulged the passwords sooner because he believed "none of the persons who requested the password information ... were qualified to have it," according to court filings.

We're starting to get solid information on the case, now that the impasse has broken (see story). But until Childs revealed the passwords, all we knew for sure was that Childs was in jail and that the network was still working but couldn't be managed.

Beyond that, it's been Rashomon in IT. Depending on who's telling the story, Childs is a brilliant network engineer who did nothing wrong. Or possibly a cyberterrorist who held the government hostage. Or maybe just an overstressed, burned-out guy who's the victim of a misunderstanding.

San Francisco's IT management? That's a bunch of tech-clueless bureaucrats. Or maybe it's a gang of goons who are out to get Childs no matter the cost. Or perhaps it's a group of conscientious public servants whose only concern was regaining control of a crucial network that might have been full of booby traps.

Childs' erstwhile co-workers? They're halfwits who couldn't manage that backbone with both hands and a map. Or innocent victims of a network guru with a God complex. Or enablers who helped create the mess by their silence.

From news reports to blog comments, the reactions have been stunning in their vehemence and variety. And there's not one yawning gulf here, but many: between techies and nontechnical managers, between gurus and regular IT grunts, between designers and administrators, between security wonks and operations guys, between practicing network experts and best-practices pundits.

It seems like suddenly we can agree on nothing. But maybe we can all recognize this:

Terry Childs was a single point of failure.

Never mind whether he's saint or sinner, villain or victim. Set that aside for now.

Focus on this: Childs was the only guy who understood that fiber backbone network. He designed it. He ran it. He maintained it. He controlled it. And nobody could replace him.

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