As I see, perl has updated LDAP library.
In this update, they changed some thing and maybe some one will have an error when install zimbra. When I build new zimbra from the source, every thing is ok but when I installed it, an error happened when zimbra tried to set up TLS in ldap, it said that: can not determine peer host for verification.
I checked LDAP.pm in zimbracommon directory and see they made some change. If you use the old LDAP.pm, this error did not happen.