Cannot connect to WMI provider.You do not have permission or the server is unreachable. Note that you can only manage SQL Server 2005 servers with SQL Server Configuration Manager.

Step 1:- Verify which version of sql server 2005/2008
Step 2:- Go to Shared folder on C drive "C:\Program Files\Microsoft SQL Server\90\Shared"
Step 3:- Verify the following file present in the folder
sqlmgmproviderxpsp2up.mof

Step 4:- If missing copy from other instance folder
Step 5:- Register as shown below,

C:\>mofcomp "C:\Program Files\Microsoft SQL Server\90\Shared
\sqlmgmproviderxpsp2up.mof"


SOLVED Problem.