I am going live with section.io and seeing 403 forbidden errors returned from Nexcess Hosting

If you have Nexcess hosting for your application and are connecting to section.io, the Nexcess web application firewall may be set up such that it will inadvertently block traffic from a caching layer like section.io.

If you see 403 Forbidden errors when setting up and testing section.io in front of your Nexcess hosted website, you should contact Nexcess who will modify the firewall rules to accept traffic.