Rackspace’s DNS rate limiting

Today, while I was having lunch, I started receiving email notifications about Niume’s servers not responding. In the beginning it was just one server, so I removed it from the load balancer, then restarted the httpd process and put it back again.

But then the other servers started behaving the same way, even though the load was well under capacity. Between those email notifications, there was a Rackspace support email:

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