.net – System.Management访问被拒绝

internal static int GetNumberOfProcessors()
{
    List<string> list = new List<string>();
    ManagementClass mgmt = new ManagementClass("Win32_Processor");
    foreach (ManagementObject obj in mgmt.GetInstances())
    {
        string item = obj.Properties["SocketDesignation"].Value.ToString();
        if (!list.Contains(item))
        {
            list.Add(item);
        }
    }
    return list.Count;
}

它像这样爆炸：

[ManagementException: Access denied ]
   System.Management.ManagementException.ThrowWithExtendedInfo(ManagementStatus errorCode) +377984
   System.Management.ManagementScope.InitializeGuts(Object o) +654
   System.Management.ManagementScope.Initialize() +162
   System.Management.ManagementObject.Initialize(Boolean getObject) +492
   System.Management.ManagementClass.GetInstances(EnumerationOptions options) +122
   System.Management.ManagementClass.GetInstances() +6

这段代码在cassini上本地运行正常,但在我们的测试版服务器上爆炸了.任何人都知道该怎么办？