Access is denied 0x80070005 in ASP.net using SQL Server SMO - asp.net

Question

I am trying to create a simple web form which will give me a service restart button onscreen.
Upon clicking the button, I am creating an SMO object to talk to a SQL Server database and trying to stop and start the MSSQLSERVER service. All goes well until the Stop() method is called, at which point an exception is thrown stating:
Access is denied. (Exception from HRESULT: 0x80070005
(E_ACCESSDENIED))
The code under the button is as follows:
// connect the to server
ManagedComputer computer =
new ManagedComputer("172.16.150.52",#"Administrator","secret");
// return if there is a problem
if (computer.Services["MSSQLSERVER"] == null)
{
PageErrorMessage = "Bad or missing service \"MSSQLSERVER\"";
return;
}
// get the SQL Server Service
Service sqlServer = computer.Services["MSSQLSERVER"];
// is the server running?
if (sqlServer.ServiceState == ServiceState.Running)
sqlServer.Stop();
// wait for it to stop completely
int timeout = 0;
while (sqlServer.ServiceState != ServiceState.Stopped || timeout <= 60)
{
Thread.Sleep(1000);
sqlServer.Refresh();
timeout++;
}
if (timeout > 60)
{
PageErrorMessage = "Stop operation has timed out after 60secs";
return;
}
// start it again!
sqlServer.Start();
The IP address, username & password are 100% correct. Does anyone know why this would throw an AccessDenied exception?

Answer 1

It sounds like you're missing the UAC. Often, to do system-wide tasks such as rebooting, shutting down (and probably also starting/stopping services), you have to get the elevated priviliges, which includes obtaining a token, etc.
Take a look at this article - http://www.codeproject.com/KB/vista-security/UAC__The_Definitive_Guide.aspx - it has helped me on a few occasions.
But http://www.codeproject.com/KB/vista-security/ElevatedPrivilegesDemand.aspx might also be helpful.
I have only ever done this client side myself - I don't know how it works when running on a server. For that, you might want to take a look at: http://blogs.msdn.com/b/lightswitch/archive/2011/04/07/how-to-elevate-permissions-in-server-code-ravi-eda.aspx
And if it's not code, but configuration, take a look at this: http://www.lansweeper.com/kb/WMI-Access-is-denied.aspx