What are the required user account permissions for calling a method of a WMI class?

[Joseph Martell]

I am trying to make a utility program that involves changing the local computer's IP Address on Windows XP using .Net framework v3.5. I have successfully created a class that encapsulates the necessary WMI_NetworkAdap terConfiguratio n methods and attributes, BUT I cannot call the EnableStatic method from my non-Administrator account (I am using the InvokeMethod method of the .Net ManagementObjec t class)! I keep getting a return code of 91 (permission denied).

I have given my non-Administrator account the required WMI Control permissions under the Computer Management snap-in. Literally, I granted the specific non-adminstrator account all permissions from the WMI root namespace down (I specified all permissions and applied it too "this namespace and all subnamespaces" in the "adavnced" window"). I can even modify permissions for WMI control with my non-administrator account.

Despite all of this, I STILL cannot call EnableStatic without getting a return code of 91 (Access Denied). If I elevate the account to an administrator account everything works fine. This leaves me to believe that the problem is with the local security policy, not the WMI permissions. However, I cannot find a permission that would seem to be appropriate. Anyone have any ideas?

Here is some code for anyone to peruse (_moConfig is a ManagementObjec t pointing to the WMI_NetworkAdap terConfig object for my chosen adapter). Full classes can be provided upon request:

    //This is only partial code. Full classes can be supplied if required.
    public class NicConfig
    {
        private static string _configQuery = @"SELECT * FROM Win32_NetworkAdapterConfiguration WHERE MACAddress LIKE '{0}' AND IPEnabled = 1";
        public NicConfig(MACAddress mac)
        {
            //mac is a class that I created for the adapter's MAC address
            SelectQuery query = new SelectQuery(string.Format(_configQuery, mac.ToString()));
            ManagementObjectSearcher searcher = new ManagementObjectSearcher(query);

            ManagementObjectCollection configs = searcher.Get();
            foreach (ManagementObject config in configs)
            {
                _moConfig = config;
            }
        }

        public bool SetStaticIP(string IPAddress, string subnet)
        {
            string[] ipAddresses = { IPAddress };
            string[] subnets = { subnet };
            object[] parms = {ipAddresses, subnets};
            object result = _moConfig.InvokeMethod("EnableStatic", parms);
            uint nResult = (uint)result;

            return (nResult == 0);

        }