After I installed Microsoft SQL Server Reporting Services 2012 and configured it with the Reporting Services Configuration Manager and clicked on de Report Manager URL:
I got the error message:
User ‘Domain\Admin’ does not have required permissions. Verify that sufficient permissions have been granted and Windows User Account Control (UAC) restrictions have been addressed.
Turns out you have to run your browser (e.g. Internet Explorer) as an Administrator
The same is true for the Web Service URL:
The permissions granted to user ‘Domain\Admin’ are insufficient for performing this operation. (rsAccessDenied).
Run as administrator: