A new best practice emerges in SharePoint 2013 that will change how some companies are deploying SharePoint today. That new best practice is to ensure that every single web application is SSL encrypted with said SSL now terminated on the SharePoint web front ends.
Secure Sockets Layer (SSL) is a requirement for web applications that are deployed in scenarios that support server-to-server authentication and app authentication. This is such a scenario. As a prerequisite for configuring Task Synchronization, the computer that is running SharePoint Server must have SSL configured.