LDAP Sort with ordering rule fails : <p>I am trying to make an ldap query against AD LDS to get users sorted on the cn attribute. The sort ordering rule should not be the default English, but it should order according to Swedish. I am doing this with System.DirectoryServices.Protocols API in .Net.</p>

<p>To reproduce I have installed an AD LDS instance listening on port 389, and installed user object class.</p>

<p>The following code is used (base is copied from <a href="https://msdn.microsoft.com/en-us/library/bb332056.aspx?f=255&amp;MSPPError=-2147217396#sdspintro_topic5_simplesearch" rel="noreferrer">Performing a Simple Search</a> ). Ordering rule has been taken from <a href="https://msdn.microsoft.com/en-us/library/cc223325.aspx" rel="noreferrer">here</a>.</p>

<pre><code>public class LdapSorter
{

    public void SearchUsersSorted()
    {
        string hostOrDomainName = "localhost";
        string targetOu = "cn=Test";

        // create a search filter to find all objects
        string ldapSearchFilter = "(objectClass=user)";

        // establish a connection to the directory
        LdapConnection connection = new LdapConnection(hostOrDomainName);
        connection.SessionOptions.ProtocolVersion = 3;

        Console.WriteLine("\r\nPerforming a simple search ...");

        try
        {
            SearchRequest searchRequest = new SearchRequest
                                            (targetOu,
                                              ldapSearchFilter,
                                              SearchScope.OneLevel,
                                              null);

            searchRequest.Controls.Add(new SortRequestControl("cn", "1.2.840.113556.1.4.1594", false));
            //searchRequest.Controls.Add(new SortRequestControl("cn", false));
            //searchRequest.Controls.Add(new SortRequestControl("cn", true));

            // cast the returned directory response as a SearchResponse object
            SearchResponse searchResponse =
                        (SearchResponse)connection.SendRequest(searchRequest);

            Console.WriteLine("\r\nSearch Response Entries:{0}",
                        searchResponse.Entries.Count);

            // enumerate the entries in the search response
            foreach (SearchResultEntry entry in searchResponse.Entries)
            {
                Console.WriteLine("{0}:{1}",
                    searchResponse.Entries.IndexOf(entry),
                    entry.DistinguishedName);
            }
        }
        catch (DirectoryOperationException e)
        {
            Console.WriteLine("\nUnexpected exception occured:\n\t{0}\n{1}",
                              e, e.Response.ErrorMessage);
            var control = e.Response.Controls.First(c =&gt; c is SortResponseControl) as SortResponseControl;
            if (control != null)
            {
                Console.WriteLine("\nControl result: " + control.Result);
            }
        }
    }
}
</code></pre>

<p>This is the output:</p>

<pre><code>Performing a simple search ...

Unexpected exception occured:
    System.DirectoryServices.Protocols.DirectoryOperationException: The server does not support the control. The control is critical.
   at System.DirectoryServices.Protocols.LdapConnection.ConstructResponse(Int32 messageId, LdapOperation operation, ResultAll resultType, TimeSpan requestTimeOut, Boolean exceptionOnTimeOut)
   at System.DirectoryServices.Protocols.LdapConnection.SendRequest(DirectoryRequest request, TimeSpan requestTimeout)
   at System.DirectoryServices.Protocols.LdapConnection.SendRequest(DirectoryRequest request)
   at Sort.LdapSorter.SearchUsersSorted() in C:\Source\slask\DotNetSlask\Sort\LdapSorter.cs:line 41
00000057: LdapErr: DSID-0C090A3D, comment: Error processing control, data 0, v3839

Control result: InappropriateMatching
</code></pre>

<p>If using one of the two sort request controls that are commented out instead, then it works, but with English sort order.</p>
