When connecting to a SQL Server Reporting Services instance through Management Studio, I encountered the following error:
Report Server WMI Provider error:
Invalid namespace (Microsoft.SqlServer.Management.UI.RSClient)
It turns out that I was trying to connect to SSRS 2012 through SQL Server Management Studio 2014. Once I launched SSMS 2012, I was able to connect successfully, so it was a simple resolution to a somewhat confusing WMI provider error message.
Sam Lester (MSFT)