title: ldap_bind(): Unable to bind to server: Can't contact LDAP server
body: <p>I can remote access in using the admin username and password which I'm using the same username and password in the script.  but I get the following error</p>
  
  <p>Warning: ldap_bind(): Unable to bind to server: Can't contact LDAP server in </p>
  
  <p>Could not bind to the server. Check the username/password.
  Server Response:
  Error Number: -1
  Description: Can't contact LDAP server  </p>
  
  <pre><code>&lt;?php
      ini_set('display_errors',1);
      ini_set('display_startup_errors',1);
      error_reporting(-1);
  
       // Username used to connect to the server
       $username = "Administrator";
  
       // Password of the user.
       $password = "password";
  
       // Either an IP or a domain.
       $ldap_server = "10.10.10.10";
  
       // Get a connection
       $ldap_conn = ldap_connect($ldap_server);
  
       // Set LDAP_OPT_PROTOCOL_VERSION to 3
       ldap_set_option($ldap_conn, LDAP_OPT_PROTOCOL_VERSION, 3) or die ("Could not set LDAP Protocol version");
  
       // Authenticate the user and link the resource_id with
       // the authentication.
       if($ldapbind = ldap_bind($ldap_conn, $username, $password) == true)
       {
       // Setup the data that will be used to create the user
       // This is in the form of a multi-dimensional
       // array that will be passed to AD to insert.
       $adduserAD["cn"] = "testuser";
       $adduserAD["sn"] = "User";
       $adduserAD["samaccountname"] = "testuser";
       $adduserAD["objectClass"] = "user";
       $adduserAD["displayname"] = "Test User";
       $adduserAD["userPassword"] = "Welcome123!";
       $adduserAD["userAccountControl"] = 544;
  
       $base_dn = "cn=testuser,cn=Users,DC=testdomain,DC=com";
  
       // Display some "waiting" text.
       echo "Trying to add the user to the system ...&lt;br&gt;";
  
       // Attempt to add the user with ldap_add()
       if(ldap_add($ldap_conn, $base_dn, $adduserAD) == true)
       {
  
       // The user is added and should be ready to be logged
       // in to the domain.
       echo "User added!&lt;br&gt;";
       }else{
  
       // This error message will be displayed if the user
       // was not able to be added to the AD structure.
       echo "Sorry, the user was not added.&lt;br&gt;Error Number: ";
       echo ldap_errno($ldap_conn) . "&lt;br /&gt;Error Description: ";
       echo ldap_error($ldap_conn) . "&lt;br /&gt;";
       }
       }else{
       echo "Could not bind to the server. Check the username/password.&lt;br /&gt;";
       echo "Server Response:"
  
       // Error number.
       . "&lt;br /&gt;Error Number: " . ldap_errno($ldap_conn)
  
       // Error description.
       . "&lt;br /&gt;Description: " . ldap_error($ldap_conn);
       }
  
       // Always make sure you close the server after
       // your script is finished.
       ldap_close($ldap_conn);
      ?&gt; 
  </code></pre>