I manage to find a dirty way 
Log into vsphere web client
administration
SSO
configuration
hit the plus sign
add your ad but with LDAP:// xxx:3268 no LDAPS://
(apparently this issue is mainly a cert issue)
then proceed as usual with this settings (http://communities.vmware.com/people/Mike_Laverick/blog/2012/09/24/vcenter-server-appliance--single-sign-on)
test the connection
it works ...