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Facebook outage was a series of unfortunate events

Facebook says the root cause of its outage Monday involved a routine maintenance job gone awry that resulted in rendering its DNS servers unavailable, but first the entire Facebook backbone network had crashed.

To make matters worse, the loss of DNS made it impossible for Facebook engineers to remotely access the devices they needed to in order to bring the network back up, so they had to go into the data centers to manually restart systems.

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Source:: Network World – Data Center