OK, I tried everything in UNIX and Windows Accounts in Zimbra LDAP and Zimbra Admin UI - Zimbra :: Wiki
but when I get to running zmprov I get the following message:
ERROR: zclient.IO_ERROR (invoke Connection refused, server: localhost) (cause: java.net.ConnectException Connection refused)
Any suggestion will be really appreciated.
By the way, my Samba server was able to communicate with Zimbra LDAP until the above configurations were done; what makes me think it might be something related to Zimbra LDAP not allowing the nis.schema and samba.schema to be used.