I did followings on one FC4 box where zimbra running perfectly:
1. copy whole /opt/zimbra
2. copy /var/spool/cron/zimbra
3. copy zimbra scripts and links from init.d directories
Restored 1, 2, 3 to another new built FC4 box, exactly the same. When I reboot the machine, and check zimbra by "zmcontrol status", it said:
ERROR: service.FAILURE (system failure: getDirectContext) (cause: javax.naming.CommunicationException jian.cirrata.net:389)
I cleaned every process related to zimbra, and tried to start the zimbra again. I got promp asking password for LDAP.