WMI security via ASP.NET app

[groups.pete]

Hello,

I have an ASP.NET application which is querying the status of a Win32
service using WMI via ManagementObjec tSearcher object. The query is
"select state from win32_service where name='MyService '". My website
is impersonating the IIS anonymous user, using a domain user. I have
given my user the appropriate WMI security rights, and my code works
fine when run from a cmd prompt running as my domain user. However,
when I run via my ASP.NET app I get:

[ManagementExcep tion: Generic failure ]

System.Manageme nt.ManagementEx ception.ThrowWi thExtendedInfo( ManagementStatu s
errorCode) +167
System.Manageme nt.ManagementOb jectEnumerator. MoveNext() +403
It also works fine if I add my domain user to the local Administrators
group.
I guess there is something I'm missing with regard to the ASP.NET
security, can anyone point me in the right direction? Thanks for your
help.

The code is below.
ConnectionOptio ns co = new ConnectionOptio ns();
co.Authenticati on = AuthenticationL evel.Packet;

ManagementScope oScope = new ManagementScope ("\\\\" + server +
"\\root\\cimv2" , co);
WqlObjectQuery oQuery = new WqlObjectQuery( QueryString);
ManagementObjec tSearcher search = new
ManagementObjec tSearcher(oScop e,oQuery);

foreach(Managem entObject manobj in search.Get())
{
//do stuff
}