HostGator adds a global whitelist for MaxCDN IPs on their firewalls.
October 20, 2010 | David HenzelHello everyone, Some of our clients who host their websites with HostGator have been experiencing intermittent “502 Bad Gateway” errors with their Pull Zones. Investigating the issue, it appeared that some of HostGator servers’ firewalls have been temporarily blocking MaxCDN due to the traffic used to pull data off the clients’ origin servers in order to create the CDN cache. Our system engineer, Billy Vierra, contacted David Collins (HostGator CTO) about that, and David Collis was very cooperative, he made sure all our IP allocations are globally whitelisted so this problem would never occur again, thanks to him. For all our clients who use HostGator hosting, rest assured you shall never have to worry about “502 Bad Gateway” errors ever again.