 DNS, routing, you name it
Can your server resolve itself VIA DNS at the hostname you configured?
host will show you
Can you reach yourself on port 389, or is there a firewall in the way? (Try by the IP returned by the host command, NOT the loopback interface)
Is the RH firewall running?
What does ldd /opt/zimbra/openldap/libexec/slapd return?
Real server, or virtual environment?
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