WMI Query access denied?

2008-01-16 23:10:11 UTC

Scenario: This is a C# Windows Form. Works great for my local machine,
but fails with following message:
'System.UnauthorizedAccessException'
Access is denied. (Exception from HRESULT: 0x80070005
(E_ACCESSDENIED))

All I have to do is get the MAC address of remote machines. This is a
domain environment and NOT a workgroup. I did enable remote access for
the user on remote machine's WMI Control's namespace.

public class TheWorks
{
private const string CLASS_NETWORKADAPTER =
"Win32_NetworkAdapterConfiguration";
private const string QUERY_NETWORKADAPTER = "SELECT * FROM
Win32_NetworkAdapterConfiguration";
private const string PROPERTY_MACADDRESS = "MacAddress";
private const string PROPERTY_IPADDRESS = "IPAddress";

private ManagementClass _managementClass = null;
private ManagementObjectCollection _managementCollection =
null;
private ManagementScope _managementScope = null;
private ObjectQuery _query = null;
private bool _queryComplete = false;

private string _computerName = null;

public TheWorks()
{
this._managementClass = new ManagementClass(new
ManagementPath(CLASS_NETWORKADAPTER));
this._query = new ObjectQuery(QUERY_NETWORKADAPTER);
}

public TheWorks(string ComputerName): this()
{
this._computerName = ComputerName;
}

public string[] GetMacAddress()
{
System.Collections.ArrayList list = new
System.Collections.ArrayList();

this.runQuery();

foreach (ManagementObject o in this._managementCollection)
{
if (o[PROPERTY_IPADDRESS] != null &
o[PROPERTY_MACADDRESS] != null)
{
list.Add(o[PROPERTY_IPADDRESS].ToString() +
o[PROPERTY_MACADDRESS].ToString());
}
}

return (string[])list.ToArray(typeof(string));
}

public int ResultCount
{
get
{
if (this._managementCollection == null ||
this._queryComplete == false)
{
return -1;
}
else
{
return this._managementCollection.Count;
}
}
}

public string ComputerName
{
get
{
return this._computerName;
}

set
{
this._computerName = value;
}
}

private void runQuery()
{
try
{
if (this._queryComplete == false)
{
this._managementCollection =
this.getClass().GetInstances();
this._queryComplete = true;
}
}
catch (Exception ex)
{
throw ex;
}
}

private ConnectionOptions getConnectionOption()
{
ConnectionOptions conn = new ConnectionOptions();
conn.Timeout = new TimeSpan(0, 0, 0, 10);
conn.Authentication = AuthenticationLevel.Default;
conn.EnablePrivileges = true;
conn.Impersonation = ImpersonationLevel.Impersonate;
conn.Username = @"domain\username";
conn.Password = "my_lovely_password";

return conn;
}

private ManagementScope getScope()
{
if (string.IsNullOrEmpty(this.ComputerName))
{
this._managementScope = new ManagementScope(@"\\" +
Environment.MachineName + @"\root\cimv2");
}
else
{
this._managementScope = new ManagementScope(@"\\" +
this.ComputerName + @"\root\cimv2");
}

this._managementScope.Options =
this.getConnectionOption();
this._managementScope.Connect();
return this._managementScope;
}

private ManagementClass getClass()
{
this._managementClass.Scope = this.getScope();
return this._managementClass;
}
}