How to configure secure LDAP authentication (LDAPS)?

Install ldap-utils, openssl and php-ldap (php4-ldap) packages.
Upload LDAP server public certificate (or certification authority public certificate ) (PEM file) to the /etc/ssl/certs directory.
Run the "c_rehash" command to create/update certificate hashes.
Edit LDAP configuration file (/etc/ldap/ldap.conf) and add the following option:
```
TLS_CACERTDIR   /etc/ssl/certs
```
Note: Between TLS_CACERTDIR and directory must be a TAB character (don't use a space)!
Restart Apache web server.
Now, you can verify connection by using the command:
```
ldapsearch -x -H ldaps://ldap.mydomain.com
```
If it is success, you can use ldaps in your web authentication.

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