LDAP server is not operational

Question

4.25/5 (4 votes)

See more:

Hi friends,

I'm trying the code to authenticate users using LDAP. I've tried many types of code but am not able to connect to the server. It's giving "the server is not operational" or "the server could not be reached". I read somewhere that port 445 should be open. Can anyone tell, is it mandatory that port 445 to be open? Mcode snippets is as follows:

1 st type

var host = "domain name here";

          using (LdapConnection ldap = new LdapConnection(host))
          {
              ldap.AuthType = AuthType.Basic;
              ldap.Bind(new NetworkCredential("cn=Manager,dc=maxcrc,dc=com", "newpas")); //
              SearchRequest searchRequest = new SearchRequest();
              searchRequest.DistinguishedName = "cn=Manager,dc=maxcrc,dc=co";
             /earchRequest.Filter = "(&(objectClass=user))";//"(&(objectClass=user))";
              SearchResponse response =
   (SearchResponse)ldap.SendRequest(searchRequest);

              if (response.Entries.Count == 1)
              {

              }

 }

2nd type

bool isAuthenticated = true;
          using (PrincipalContext pCtx = new PrincipalContext(ContextType.Domain,"LDAP://domain "))
          {
              isAuthenticated = pCtx.ValidateCredentials("dc = maxcrc, dc = com", "secret");
          }

3rd type

var credential = new NetworkCredential("dc=maxcrc,dc=com","newpass");

          using (var con = new LdapConnection(host) { Credential = credential, AuthType = AuthType.Anonymous, AutoBind = false })
          {
              con.SessionOptions.ProtocolVersion = 3;

         
              con.Bind();


}

4th type

 string LDAP_URL = "LDAPS://domain";
            DirectoryEntry entry = new DirectoryEntry(LDAP_URL);
            entry.RefreshCache();
            Object obj = entry.NativeObject;

            DirectorySearcher search = new DirectorySearcher(entry);
            search.Filter = "(sAMAccountName=" + username + ")";
            search.PropertiesToLoad.Add("DisplayName");
            //search.PropertiesToLoad.Add("employeeID");
            search.PropertiesToLoad.Add("mail");
            //search.PropertiesToLoad.Add("SapPrimeDomText");
            SearchResult result = search.FindOne();

            if (result != null)
            {

}

I'm not even able to connect to the LDAP server .

Can anyone suggest to me how I can achieve this?

thanks darshan

Posted 11-Mar-13 5:26am

darshan559

Updated 14-Dec-16 18:11pm

Yvan Rodrigues

v4

Add a Solution

3 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Yvan Rodrigues · Answer 1 · 2013-03-11T05:46:00

Before you waste your time with code, confirm that the LDAP server to which you are trying to connect is available.

Normally one connects to an LDAP server on port tcp/389, or LDAPs on tcp/636. Poprt 445 is not required for LDAP queries. It may be required for some native Active Directory connections.

Start by trying to the server at the command line.

telnet ldap.example.com 389

If Telnet can't establish a connection, you know why your code can't.

If you are able to connect, download and try a free LDAP browser tool.

If both of the above work, it's your code's fault.

Here's a snippet of code from the last time I used LDAP authentication:

C#

/// <summary>
/// Authenticates the specified UserID.
/// </summary>
/// <param name="UserID">The user ID.</param>
/// <param name="Password">The password.</param>
/// <returns>True upon successful authentication; otherwise false.</returns>
public bool Authenticate(string UserID, string Password)
{
    var L1 = ActivityLog.AddAsync("Authenticating user '{0}'", UserID);
    if (UserID == string.Empty || Password == string.Empty)
    {
        L1.Fail(new Exception("UserID and Password cannot be empty."));
        return false;
    }

    var credential = new NetworkCredential(UserID, Password, CoreSettings.Current.ActiveDirectoryDomain);
    var server = CoreSettings.Current.LDAPServer;
    // Use round-robin DNS if it's available.
    var ips = Dns.GetHostAddresses(server);
    foreach (var ip in ips)
    {
        var L2 = ActivityLog.AddAsync(Importances.Debug, "Connecting to LDAP server '{0} ({1})'", server, ip);
        using (var ldap = new LdapConnection(server))
        {
            try
            {
                ldap.Timeout = TimeSpan.FromSeconds(LdapTimeout);
                ldap.Bind(credential);
                L2.End();
                L1.End();
                return true;
            }
            catch (Exception ex)
            {
                L2.Fail(ex);
                throw;
            }
        }
    }
    return false;
}

akhoje · Answer 2 · 2014-06-05T08:44:00

I found my answer here

http://alokkadu.wordpress.com/2010/12/24/the-server-is-not-operational-active-directory/#comment-81

You basically need to establish the trust between your machine and the AD Server. So just add the IP and the domain in the trusted sites as below.

Open your run. (Windows + R)
Type drivers
Go to etc folder
Open Hosts file in text editor
at the end add the ip address and the domain name of the Active Directory Machine.
That’s it. Your error is resolved..

Member 12905343 · Answer 3 · 2016-12-14T18:11:00

Hi,
Im trying to connect LDAP With SSL encryption using the DSO object in UFT. When Im connecting the LDAP connection manually it connecting , but connecting the code via UFT im getting an error like "Server is not operational" . Im using VBS here.
The same code is worked for other connections but it doesn't have SSL.

But trying to connect SSL for other connection im getting the "Server is not operational " error. Kindly help me to resolve the issue.
Please find the sample code I have used

"Dim oDS: Set oDS = GetObject("LDAP:")
Dim oAuth: Set oAuth = oDS.OpenDSObject("LDAP://Ip address:1636/cn=xxx-adm,ou=Human,o=Admin","xxx-adm","Password",1)

LDAP server is not operational

3 solutions

Solution 1

Solution 2

Solution 3

Add your solution here

Preview 0