The operation you are attempting requires a secure connection
Published 18 January 2018
Problem:
Microsoft.ReportingServices.Diagnostics.Utilities.SecureConnectionRequiredException: The operation you are attempting requires a secure connection (HTTPS).
Solution:
The error occurs because the SSRS server is configured to accept connections only via HTTPS, and a call is made to the report server over a standard HTTP connection.. Check out this MSDN article on how to reconfigure Reporting Services.