When you have defined that you want to Create new site collections from Site Directory and you try to create a new site you get the error: "Self-service Site Creation is not available because there is no inclusion defined." You have enabled Self-Service Site Creation in Central Management Site.
You don't have a path with wildcard inclusion in "Central Administration > Application Management > Define Managed Paths". Add one path with wildcard inclusion and you're all set. This requirement is also mentioned in TechNet.
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