UPDATE 04/12/15 10:25am CST: Server has been entirely healthy since the issue, so officially calling this issue fixed.
UPDATE 04/11/15 08:19am CST: The server is back up and all content on that host is accessible again. We'll continue to monitor the system for a while to make sure all the problems have been addressed.
One of the physical servers that hosts IndieMade sites is unresponsive, so a subset of IndieMade sites are not available. Engineers are taking a look. We'll update this ticket when we know more.