Reporting Services - Using A Web Service Via A Custom Assembly: Finding The Endpoint

I'm having a problem when using a Custom Assembly in my reports. We are using a Microsoft SQL Server 2012 Express Edition with Reporting Services and are designing our reports in M

Solution 1:

In the end it was the web.config I need to alter with the system.serviceModel. It's important to restart the Report Server otherwise the changes will not take effect. Problem fixed.