Can't connect to Reporting Services using Microsoft SQL Server Management Studio

When I try to connect to the Reporting Services using Microsoft SQL Server Management Studio, the following error message propmpts up:

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ADDITIONAL INFORMATION:
The request failed with HTTP status 401: Unauthorized. (Microsoft.SqlServer.Management.UI.RSClient)
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Is there any settings that I need to do in the "Reporting Services Configuration Manager" ?

Thanks.

Best regards,

Michael Wu

Did you found out how to fix this? I am getting exactly the same error.