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Re:Slack is down by ratsimihah on Monday November 23, 2015 @02:54PM (#10616851)
| "Back-end server is at capacity"

DDoS?

Re:Slack is down by Xorlev on Monday November 23, 2015 @03:14PM (#10617002)
503 = at capacity, default response an ELB returns when all the servers in the ELB are OutOfService (or missing).
Re:Slack is down by Goopplesoft on Monday November 23, 2015 @03:15PM (#10617003)
Also AWS's error code for no healthy nodes in elb.