i'm trying to install Zimbra on a freshly installed FC3 Box:
[root@abc tmp]# uname -a
Linux abc.xyz.ab 2.6.12-1.1378_FC3 #1 Wed Sep 14 04:24:31 EDT 2005 i686 i686 i386 GNU/Linux

During install i get:

Preparing packages for installation...
ERROR: service.FAILURE (system failure: getDirectContext) (cause: javax.naming.CommunicationException localhost:389)

Preparing packages for installation...
Preparing packages for installation...


Generating a 1024 bit RSA private key
writing new private key to '/opt/zimbra/ssl/ssl/ca/ca.key'
** Creating CA cert

Signature ok
subject=/C=US/ST=N/A/L=N/A/O=Zimbra Collaboration Suite/CN=abc.xyz.ab
Getting Private key
** Importing CA

Certificate was added to keystore
keytool error: java.io.FileNotFoundException: /opt/zimbra/java/jre/lib/security/cacerts (Permission denied)

** Creating keystore

COMMAND: zmcertinstall mailbox
** Importing server cert
keytool error: java.lang.Exception: Failed to establish chain from reply

Subsequent starting of the zimbra-servers is failing....
(only errors listed)

from the log:
Oct 2 00:25:00 abc zimbramon[6440]: 6440:info: start app postfix
Oct 2 00:25:01 abc zimbramon[6440]: 6440:err: SMTP RESPONSE: FAILURE from localhost: problem connecting to "localhost", port 25: Connection ref

on the console:
[root@abc zcs]# /etc/init.d/zimbra start
Calling startup (abc.xyz.ab)
perl /opt/zimbra/bin/zmmon &
Soap call failed: 500 Can't connect to localhost:7777 (connect: Connection refused) at /opt/zimbra/bin/zmcontrol line 230

Any ideas whats wrong?
Thanks in advance for help!