Thread:Extension talk:LDAP Authentication/Incorrect Password Error/reply (3)

The debug log specifically says this:

"It looks like you are missing LDAP support; please ensure you have either compiled LDAP support in, or have enabled the module. If the authentication is working for you, the plugin isn't properly detecting the LDAP module, and you can safely ignore this message."

You need to ensure the LDAP module is enabled...