I created a virtual directory within IIS which seems to solve the Problem that there's nothing visible but I get a new error now. That error only appears in the new testblog, the primary one still works without a problem.
There is no 'PassportAuthentication' module in the application to remove.
Anyone may now know what's going on?
Line 127: <add name="RightModule" type="BlogEngine.Core.Right, BlogEngine.Core"/>
Line 128: <!--Remove the default ASP.NET modules we don't need-->
Line 129: <remove name="PassportAuthentication"/>
Line 130: <remove name="Profile"/>
Line 131: <remove name="AnonymousIdentification"/>
Source File: ...blog\web.config Line: 129