WMI InvokeMethod for StartService does not work when used with ManagementOperationObserver on IIS

Question

Hi,
I am using .net 4.5 and C# to remotely restart the services. I am using WMI to do this task.  This code works when called from windows application on the machine, but same code when used inside web application it gives exception of invalid parameter.
We saw it log error in System Event log 
The machine-default permission settings do not grant Local Activation permission for the COM Server application with CLSID
{49BD2028-1523-11D1-AD79-00C04FD8FDFF}
 and APPID
{49BD2028-1523-11D1-AD79-00C04FD8FDFF}
 to the user IIS APPPOOL\<app pool user> SID (S-1-5-82-634865507-143429395-1373251082-3464226226-3883016302) from address LocalHost (Using LRPC). This security
permission can be modified using the Component Services administrative tool.
I am pasting below code for reference.
m.InvokeMethod(observer, "Startservice", null, null);
//wait until invoke method is complete or 30 sec timeout
int intCount = 0;
while
(!completionHandlerObj.IsComplete)
if (intCount > 60)
MessageBox.Show("Inside 30 seconds");
break;
//wait 1 sec.
System.Threading.Thread.Sleep(1000);
//increment counter
intCount++;
//see if call was successful.
if (HandlerObj.ReturnObject.
Properties["returnValue"].Value.ToString() == "0")
isStarted = true;
Dhanaji

Answer 1

For web apps the context will be the context of the app pool.  Unless you set the app pool to run as a user account that has admin privileges on the remote machine then you won't be able to control the services on a remote machine.  If you have
enabled Win auth such that the app runs in the context of the remote user then you might need to turn on delegation otherwise the hop won't work.
Note that if you are using Win auth then consider using ServiceController instead which provides the same functionality as WMI but with a cleaner syntax.  This wouldn't work if you need to impersonate a user though.
Michael Taylor
http://blogs.msmvps.com/p3net