I have tried more than 8 times to install Zimbra without any luck. I got the same error: Initializing ldap...FAILED (28416) error.
I have stopped Firewalls, httpd and Sendmail.
I am installing zimbra on Fedora 7.
Her it is

[root@mail zcs-5.0.5_GA_2201.F7.20080417022547]# ./install.sh

Operations logged to /tmp/install.log.3252
Checking for existing installation...
zimbra-ldap...NOT FOUND
zimbra-logger...NOT FOUND
zimbra-mta...NOT FOUND
zimbra-snmp...NOT FOUND
zimbra-store...NOT FOUND
zimbra-apache...NOT FOUND
zimbra-spell...NOT FOUND
zimbra-proxy...NOT FOUND
zimbra-archiving...NOT FOUND
zimbra-cluster...NOT FOUND
zimbra-core...NOT FOUND


PLEASE READ THIS AGREEMENT CAREFULLY BEFORE USING THE SOFTWARE.
ZIMBRA, INC. ("ZIMBRA") WILL ONLY LICENSE THIS SOFTWARE TO YOU IF YOU
FIRST ACCEPT THE TERMS OF THIS AGREEMENT. BY DOWNLOADING OR INSTALLING
THE SOFTWARE, OR USING THE PRODUCT, YOU ARE CONSENTING TO BE BOUND BY
THIS AGREEMENT. IF YOU DO NOT AGREE TO ALL OF THE TERMS OF THIS
AGREEMENT, THEN DO NOT DOWNLOAD, INSTALL OR USE THE PRODUCT.

License Terms for the Zimbra Collaboration Suite:
http://www.zimbra.com/license/zimbra..._eula_2.1.html


Press Return to continue

Checking for prerequisites...
NPTL...FOUND
sudo...FOUND sudo-1.6.8p12-14
libidn...FOUND libidn-0.6.8-4
fetchmail...FOUND fetchmail-6.3.7-2
gmp...FOUND gmp-4.1.4-12.3
bind-libs...FOUND bind-libs-9.4.2-4
vixie-cron...FOUND vixie-cron-4.1-84
libtool-ltdl...FOUND libtool-ltdl-1.5.22-11
/usr/lib/libstdc++.so.6...FOUND
Prerequisite check complete.
Checking for standard system perl...

Checking for installable packages

Found zimbra-core
Found zimbra-ldap
Found zimbra-logger
Found zimbra-mta
Found zimbra-snmp
Found zimbra-store
Found zimbra-apache
Found zimbra-spell
Found zimbra-proxy


Select the packages to install

Install zimbra-ldap [Y]

Install zimbra-logger [Y]

Install zimbra-mta [Y]

Install zimbra-snmp [Y]

Install zimbra-store [Y]

Install zimbra-apache [Y]

Install zimbra-spell [Y]

Install zimbra-proxy [N]
Checking required space for zimbra-core
checking space for zimbra-store

Installing:
zimbra-core
zimbra-ldap
zimbra-logger
zimbra-mta
zimbra-snmp
zimbra-store
zimbra-apache
zimbra-spell

The system will be modified. Continue? [N] y

Removing /opt/zimbra
Installing packages

zimbra-core......zimbra-core-5.0.5_GA_2201.F7-20080417022547.i386.rpm...done
zimbra-ldap......zimbra-ldap-5.0.5_GA_2201.F7-20080417022547.i386.rpm...done
zimbra-logger......zimbra-logger-5.0.5_GA_2201.F7-20080417022547.i386.rpm..d
one
zimbra-mta......zimbra-mta-5.0.5_GA_2201.F7-20080417022547.i386.rpm...done
zimbra-snmp......zimbra-snmp-5.0.5_GA_2201.F7-20080417022547.i386.rpm...done
zimbra-store......zimbra-store-5.0.5_GA_2201.F7-20080417022547.i386.rpm...do
ne
zimbra-apache......zimbra-apache-5.0.5_GA_2201.F7-20080417022547.i386.rpm..d
one
zimbra-spell......zimbra-spell-5.0.5_GA_2201.F7-20080417022547.i386.rpm...do
ne
Operations logged to /tmp/zmsetup.01001900-0000147859416.log
Setting defaults... MX: mail.cfn.local (192.168.1.225)

Interface: 192.168.1.225
Interface: 127.0.0.1
192.168.1.225
done.
Checking for port conflicts

Main menu

1) Common Configuration:
2) zimbra-ldap: Enabled
3) zimbra-store: Enabled
+Create Admin User: yes
+Admin user to create: admin@mail.cfn.local
******* +Admin Password UNSET
+Enable automated spam training: yes
+Spam training user: spam.wn2wfcvvcd@mail.cfn.local
+Non-spam(Ham) training user: ham.xwm1k7flh@mail.cfn.local
+Global Documents Account: wiki@mail.cfn.local
+SMTP host: mail.cfn.local
+Web server HTTP port: 80
+Web server HTTPS port: 443
+Web server mode: http
+IMAP server port: 143
+IMAP server SSL port: 993
+POP server port: 110
+POP server SSL port: 995
+Use spell check server: yes
+Spell server URL: http://mail.cfn.local:7780/aspell
.php

4) zimbra-mta: Enabled
5) zimbra-snmp: Enabled
6) zimbra-logger: Enabled
7) zimbra-spell: Enabled
8) Default Class of Service Configuration:
r) Start servers after configuration yes
s) Save config to file
x) Expand menu
q) Quit

Address unconfigured (**) items (? - help) 3

Store configuration

1) Status: Enabled
2) Create Admin User: yes
3) Admin user to create: admin@mail.cfn.local
** 4) Admin Password UNSET
5) Enable automated spam training: yes
6) Spam training user: spam.y9gnp3cfk@mail.cfn.local
7) Non-spam(Ham) training user: ham.yg0p5vjk0n@mail.cfn.local
8) Global Documents Account: wiki@mail.cfn.local
9) SMTP host: mail.cfn.local
10) Web server HTTP port: 80
11) Web server HTTPS port: 443
12) Web server mode: http
13) IMAP server port: 143
14) IMAP server SSL port: 993
15) POP server port: 110
16) POP server SSL port: 995
17) Use spell check server: yes
18) Spell server URL: http://mail.cfn.local:7780/aspell
.php

Select, or 'r' for previous menu [r] 4

Password for admin@mail.cfn.local (min 6 characters): [zU7H07CF5] mypassword

Store configuration

1) Status: Enabled
2) Create Admin User: yes
3) Admin user to create: admin@mail.cfn.local
4) Admin Password set
5) Enable automated spam training: yes
6) Spam training user: spam.y9gnp3cfk@mail.cfn.local
7) Non-spam(Ham) training user: ham.yg0p5vjk0n@mail.cfn.local
8) Global Documents Account: wiki@mail.cfn.local
9) SMTP host: mail.cfn.local
10) Web server HTTP port: 80
11) Web server HTTPS port: 443
12) Web server mode: http
13) IMAP server port: 143
14) IMAP server SSL port: 993
15) POP server port: 110
16) POP server SSL port: 995
17) Use spell check server: yes
18) Spell server URL: http://mail.cfn.local:7780/aspell
.php

Select, or 'r' for previous menu [r] r

Main menu

1) Common Configuration:
2) zimbra-ldap: Enabled
3) zimbra-store: Enabled
4) zimbra-mta: Enabled
5) zimbra-snmp: Enabled
6) zimbra-logger: Enabled
7) zimbra-spell: Enabled
8) Default Class of Service Configuration:
r) Start servers after configuration yes
s) Save config to file
x) Expand menu
q) Quit

*** CONFIGURATION COMPLETE - press 'a' to apply
Select from menu, or press 'a' to apply config (? - help) a
Save configuration data to a file? [Yes]
Save config in file: [/opt/zimbra/config.12948]
Saving config in /opt/zimbra/config.12948...done.
The system will be modified - continue? [No] y
Operations logged to /tmp/zmsetup.01001900-0000154367960.log
Setting local config values...done.
Setting up CA...done.
Deploying CA to /opt/zimbra/conf/ca ...done.
Creating SSL certificate...done.
Installing mailboxd SSL certificates...done.
Initializing ldap...failed. (28416)


ERROR



Configuration failed

Please address the error and re-run /opt/zimbra/libexec/zmsetup.pl to
complete the configuration.

Errors have been logged to /tmp/zmsetup.01001900-0000154367960.log


cat /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 localhost.localdomain localhost
192.168.1.225 mail.cfn.local mail

Thank for you help