[SOLUTION] PHP 5.4 error ldap_search(): Search: Can’t contact LDAP server

Lately I got problem with my application which need LDAP for authentication process, in my local server there are no problem. However, once I have uploaded into production server there are some problem appear such as cannot connect to LDAP server (error ldap_search(): Search: Can’t contact LDAP server).

I used Centos 7 for my operating system, PHP 5.4.16 and MySQL 5.7.21. I found some solutions, but I here are the solution worked for me :

  1. Install / reinstall php-ldap module.
  2. Add 1 line of PHP code to set option for LDAP connection.


First thing first you need to check is your php modules, is your php-ldap module already loaded or not? You can check it on your phpinfo();

If there is no php-ldap module installed, please follow these steps carefully to install the php-ldap module :

  1. Run this script yum install php-ldap
  2. After installation success, restart your httpd service, you may use this script systemctl start httpd
  3. Add this script below your ldap_connect script : ldap_set_option($your_ldap_connection, LDAP_OPT_PROTOCOL_VERSION, 3);
  4. Done.

Well, I hope my solution above help you out as well.

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