Answer by RamAM

This happened to me in my development environment. The issue was I dont use a full Windows domain setup. My solution was to change my SSRS authentication configuration so that I could login using my Windows login credentials. To do this edit Find the authentication block (CTRL-F Authentication), comment out > `` so it becomes > `` Do the same for any other methods listed in that block. In that same authentication block add > `` Next shutdown the RS service (using RCSM is fine). Next startup the service. Now it should prompt you to login and it should work on the first try when you enter your windows username and password info. This is not the right way to configuration SSRS in many scenarios - but it may be just the right thing in your development environment. cheers ram