title: Zimbra Login authentication error with external LDAP
body: <p>I'm trying to login Zimbra using <strong>external LDAP</strong> which is <strong><em>openLDAP</em></strong>. When I test login authentication using Zimbra Administration console, test is successful. But I can't login Zimbra using Web client. Getting an error like this: </p>
  
  <p><code>The username or password is incorrect. Verify that CAPS LOCK is not on, and then retype the current username and password.</code> </p>