You might get the following Error when trying to open SQL Server 2012 Configuration Manager:
Cannot connect to WMI provider. You do not have permission or the server is unreachable. Note that you can only manage SQL Server 2005 and later servers with SQL Server Configuration Manager. Invalid class [0x80041010]
To resolve this, register the WMI classes manually by using mofcomp.
At an elevated command Prompt type:
C:\>mofcomp "C:\Program Files (x86)\Microsoft SQL Server\110\Shared\sqlmgmproviderxpsp2up.mof"