I have zimbra 6 open source edition.

I enabled ldaps using the following commands

su - zimbra
zmlocalconfig -e ldap_master_url=ldaps://mymaster.somewhere.com:636
zmlocalconfig -e ldap_url=ldaps://myreplica.somewhere.com:636
zmlocalconfig -e ldap_starttls_supported=0
zmlocalconfig -e ldap_port=636
zmcontrol stop
zmcontrol start

from the link
How to enable ldaps - Zimbra :: Wiki

After ldaps is enabled, the addressbook is not accessible by the mail client.
It reports that the server is not accessible.

I can do the following
telnet mail.server.com 636 from anywhere in the interner.

But the ldap tools like jxplorer, thunderbird are not connecting to ldaps.
Addressbook is working from the web UI of the zimbra server.

What may the reason?
How to make it accessible for all?