RPC server is unavailable

[DKn]

Hai,

I am having C#.NET windows application, to read the system info from Remote system through WMI.

For Win2003 server machine, the WMI connection is successful.
For the Machines Vista and XP , WMI connection is giving the error " RPC server is unavialable. But for the same machines , i am able get data by WMIC commands with the same credentials. What will be the problem.

Here is the code
ManagementScope wmiMgmtScope = null;
ConnectionOptio ns connOptions = new ConnectionOptio ns();
connOptions.Use rname ="USERNAME";
connOptions.Pas sword ="PASSWORD";
wmiMgmtScope = new ManagementScope ("\\\\" + strHost + "\\root\\cimv2" , connOptions);
wmiMgmtScope.Op tions.Impersona tion = ImpersonationLe vel.Impersonate ;
wmiMgmtScope.Op tions.EnablePri vileges = true;
try
{
wmiMgmtScope.Co nnect();
}