How can I remove auth page when open Report Server page?

Hi Anonymous ,At last I copy Microsoft.Samples.ReportingServices.CustomSecurity.dll in both PowerBI and ReportServer\bin folders, I can successfully save a report to Report Server from desktop.

But when I open the report on the server in IE, it got another error.Here is the logs:

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2017-07-25 23:13:53.1729|INFO|15|Received request administrator RequestID = 7b474824-2dc3-d120-acfe-cdeb0f0ac9eb ClientSessionID = faed8e08-4209-3766-f043-507137a53316 2017-07-25 23:13:53.2989|ERROR|14|

Failure in conceptualschema| RequestID = 7b474824-2dc3-d120-acfe-cdeb0f0ac9eb ClientSessionID = faed8e08-4209-3766-f043-507137a53316 System.NotSupportedException: PortalIdentity is not supported.

在 Microsoft.PowerBI.ReportServer.ExploreHost.UserIdentityConnectionImpersonatorFactory.CreateImpersonator(IIdentity identity) 在 Microsoft.PowerBI.ReportServer.ExploreHost.RSPowerViewHandler.GetModelInfo(String id) 

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So what is "System.NotSupportedException: PortalIdentity is not supported" mean? How could I do to solve it?

public void GetUserInfo(out IIdentity userIdentity, out IntPtr userId)
{

userIdentity = new GenericIdentity("administrator");
// initialize a pointer to the current user id to zero
userId = IntPtr.Zero;
}

It seems GenericIdentity is not a WindowIdentity, so a NotSupportedException throwed.

I already defined impersonate = false in web.config.

But what kind of icIdentity should I return?return WindowIdentity("administrator") doesn't work.