Set nginx load balancing in two servers with ldap server together fail

Hi :

This cluster are two servers only all LB+ applications installed there.

I set two nginx LB with ldap 389 servers port but nginx bind my ldap port 389 and case failure turn on the ldap ( i set loop back interface alias the virtual ip) .. (If i used IPVS ultamonkey this model can be achived )

Is nginx must dedicated on separate server that out of my applications? meant 3 servers at least ..1 balance + 2 ldaps
Seem this nginx msut occupy the ports in order to forward ....it 's not like other layer 7 LB .


Server 1 Server 2

nginx+ ldap nginx + ldap