In recent days I noticed that my site, and other WordPress sites were failing to properly load. I’ve debugged the issue, and found that recent versions of Jetpack require this javascript file on every page load. This file is served from a WordPress content distribution network run by Edgecast. While Edgecast claim to support IPv6, in reality, they don’t.
As shown below, they have major issues with MTU size on their IPv6 network.
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