impersonation issue when executing a Process.Start("Shutdown",strArgs)

[Mixedmingle]

guys,

I am trying to execute a shutdown on a remote machine.
however eventhough I have setup impersonation and according to the
retrieve username it is using the correct user(Domain\genericuser),
the remote machine still tells me the user executing the command is
the domain\Webserver$ account (after giving this account admin
permissions on the remote computer)

What am I missing here?

Code
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string strArgs = " /m \\\\" + ServerName + " /r";
WindowsIdentity p = WindowsIdentity.GetCurrent();
WindowsImpersonationContext impersonationContext = p.Impersonate();
System.Diagnostics.Process.Start("Shutdown", strArgs);
impersonationContext.Undo();


---------------------------------------------------------------
web.config

<authentication mode="Windows"/>
<identity impersonate="true" userName="Domain\generiguser"
password="password"/>


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please help me out here.

thanks
Regards
Erik