Wel i got solved in a very easy way, on windows machine you should add on your hosts file two records:
1. for you ad server (it's prefered to use the domain name for this, in ad infraestructures almost always the domain has a A record to AD server.
2. for your zimbra server
Try to do a ping to both servers by their hostnames, it sould be working,
__________________ |>Z - Sync S.A.  |