Same problem. Just happened last night. We have an enterprise site and its killing our site. 30 seconds to load. I have never seen this before and have no idea what what is using max.cdn on my site. Dire need of assistance in figuring this out.
URL: https://simplecdn.maxcdn.com/
Host: simplecdn.maxcdn.com
IP: 69.174.36.87
Location: Studio City, CA
Error/Status Code: 12029
Start Offset: 1.134 s
DNS Lookup: 109 ms
Initial Connection: ms
Time to First Byte: 0 ms
Content Download: 0 ms
Bytes In (downloaded): 0.0 KB
Bytes Out (uploaded): 0.0 KB