关于sdk:Access Denied Error in call CRM 2013 Web Service

Access Denied Error in calling CRM 2013 Web Service

我有一个简单的控制台应用程序，用于测试连接到 MS Dynamics CRM。
MS Dynamics CRM 2011 一切正常，但调用 2013 或更高版本时，会引发"拒绝访问"错误。
我的源代码是：

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static void Main(string[] args)
{
try
{
OrganizationServiceProxy _orgService;
Uri uri = new Uri("http://mycrm.mylab.com/XRMServices/2011/Organization.svc");

System.ServiceModel.Description.ClientCredentials clientCredentials = new System.ServiceModel.Description.ClientCredentials();
clientCredentials.Windows.ClientCredential = new System.Net.NetworkCredential("[email protected]","mypsw","mylab.com");

OrganizationServiceProxy orgService = new OrganizationServiceProxy(uri, null, clientCredentials, null);

QueryExpression query = new QueryExpression("systemuser");
query.ColumnSet = new ColumnSet(new string[] {"systemuserid" });
query.Criteria = new FilterExpression();

orgService.RetrieveMultiple(query);

}
catch (Exception ex)
{

}
}

CRM 2011 和 2013 中的用户名/密码和安全角色相同。
有没有人可以帮助我？