Facebook’s Reason For Its Six-hour Outage On Monday

Facebook said in a blog post on Monday night that the six-hour outage that knocked out Instagram, Messenger, and Whatsapp was caused by a router configuration change, not a hack or attempt to access user data.

The explanation is brief, but it appears that Facebook’s machines were unable to communicate with one another — Facebook claims that “this disruption to network traffic had a cascading effect on the way our data centres communicated, bringing our services to a halt.”

CEO Mark Zuckerberg issued an apology on Monday evening, stating that the platforms would be restored. “I apologise for the inconvenience today; I understand how much you rely on our services to stay connected with the people you care about.”

The issues appeared to start with a routine BGP update that went wrong, erasing the DNS routing information required by Facebook to allow other networks to find its sites.

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