При попытке получить группы авторизации произошла ошибка (5)

Эту ошибку я получаю, если запускаю приложение на сервере, но не локально. Почему это происходит на сервере, а не локально ???

List<GroupPrincipal> result = new List<GroupPrincipal>();

// establish domain context
PrincipalContext yourDomain = new PrincipalContext(ContextType.Domain);

// find your user
UserPrincipal user = UserPrincipal.FindByIdentity(yourDomain, userName);

// if found - grab its groups
if (user != null)
{
//here happens the error on server.
PrincipalSearchResult<Principal> groups = user.GetAuthorizationGroups();

Пожалуйста, помогите мне.

трассировка стека:

   [PrincipalOperationException: While trying to retrieve the authorization groups, an error (5) occurred.]
   System.DirectoryServices.AccountManagement.AuthZSet..ctor(Byte[] userSid, NetCred credentials, ContextOptions contextOptions, String flatUserAuthority, StoreCtx userStoreCtx, Object userCtxBase) +317263
   System.DirectoryServices.AccountManagement.ADStoreCtx.GetGroupsMemberOfAZ(Principal p) +441
   System.DirectoryServices.AccountManagement.UserPrincipal.GetAuthorizationGroupsHelper() +78
   System.DirectoryServices.AccountManagement.UserPrincipal.GetAuthorizationGroups() +11
   IntegrationApp.App_Code.ActiveDir.GetGroups(String userName) in C:\Documents and Settings\mta\My Documents\IntegrationApp\IntegrationApp\App_Code\3-Tier\DAL\ActiveDir.cs:54
   IntegrationApp.App_Code._3_Tier.BAL.DatabaseBAL.BepaalDefaultNiveau2(String melder) in C:\Documents and Settings\mta\My Documents\IntegrationApp\IntegrationApp\App_Code\3-Tier\BAL\DatabaseBAL.cs:75
   IntegrationApp.Detailscherm.VulLijsten() in C:\Documents and Settings\mta\My Documents\IntegrationApp\IntegrationApp\Detailscherm.aspx.cs:89
   IntegrationApp.Detailscherm.Page_Load(Object sender, EventArgs e) in C:\Documents and Settings\mta\My Documents\IntegrationApp\IntegrationApp\Detailscherm.aspx.cs:30
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +25
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +42
   System.Web.UI.Control.OnLoad(EventArgs e) +132
   System.Web.UI.Control.LoadRecursive() +66
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2428