The configuration options for K2 Services reside in IIS configuration for the virtual directory and three main sections of the K2 Services virtual directory web.config – <services>, <bindings> and <basicAuthentication>. Details on the web.config location and the options available for each section can be found in the product documentation under the breadcrumb: Developer Reference > Services Reference > K2 Services > Configuration ( 

The "K2 Services Recommended Configuration" document has been created to provide more information on the relationship between the sections and their settings, including the K2 recommended settings.  For more information, download the PDF from the link available on the right hand menu bar.