I was trying to install Zimbra on a SUSE 10 SP2 clean server. The install went fine until it got to the final configuration screen. I go the
"Address unconfigured (**) items or correct ldap configuration (? - help)"
message and could not fix the ldap configuration no matter what I did. The zmsetup.log file had several entries that said
"failed: Unable to contact ldap at ldap://hostname.domainname.com:389: Connection refused"
My hosts and resolv.conf files were correct DNS was fine.
My server name used capital letters. On a hunch I change the server name to all lower case. This after I rebooted and ran zmsetup.pl the configuration was happy again. FYI