**Hello guys, 

I keep trying for more than a week to set up the LDAP authentication on my zabbix server on premise. I checked all the setting, credentials for to many times and are correct (I use the same credentials and setting on another server and they are working) and something went wrong..

I still receive the error: 

• ldap_bind(): Unable to bind to server: Invalid credentials [authentication.php:135 → CLdapAuthValidator->validate() → CLdap->checkPass() → ldap_bind() in include/classes/ldap/CLdap.php:114]
• LDAP: cannot bind by given Bind DN.

I know this error is very often encountered and I checked on many blogs but nothing..
What can I do?

Thanks a lot,
Raul

See attached patch file...