Paged LDap search fails with “The requested attrib

Question

I need to get the 'employeenumber' of all the employees whose 'epersonstatus=REMOVE' using an Ldap search implemented using .NET/C# like:

var connection = new LdapConnection("foo.bar.com:389");

connection.AuthType = AuthType.Anonymous;
connection.SessionOptions.ProtocolVersion = 3;
connection.Bind();

var request = new SearchRequest(
                 "dc=root,dc=com",
                 "(epersonstatus=REMOVE)", 
                 SearchScope.Subtree,
                 new string[] { "employeenumber" }); 

Since there are thousands of entries I am using paged requests as proposed here: http://dunnry.com/blog/PagingInSystemDirectoryServicesProtocols.aspx

I have also checked that the server supports paged requests as proposed here: iPlanet LDAP and C# PageResultRequestControl

Once the flow reaches:

SearchResponse response = connection.SendRequest(request) as SearchResponse;

I get a DirectoryOperationException with message "The requested attribute does not exist".

By running the same query on a LDap client like softerra I get the entries (a thousand) and the error.

Some help would be greatly appreciated.

Answer 1

I had a similar issue.

When using paged search, I got the exception "The server does not support the control. The control is critical.", when using non-paged search I received results (at least as long as the filter restricted the maximum number).

However I found out, that the error message is misleading - The problem was buried in the authentication.

Using AuthType.Basic (or AuthType.Anonymous) I received the error. Bus as soon as I switched to AuthType.Ntlm it worked.

Hope this helps...