21.1 LDAP server configuration
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## 21.1 LDAP server configuration

Usage of the LDAP service in Kerio MailServer is easy. Simply, the following two conditions must be met:

- At least one LDAP service or Secure LDAP must be run in Kerio MailServer.

- The user must have his/her contacts defined in the contacts folder or must have subscribed at least one public or shared contact. No contacts will be found unless this condition is met.

### Note

If Kerio MailServer is protected by a firewall and the LDAP service is intended to be available, the appropriate ports must be open (`389` for the LDAP service and `636` for Secure LDAP). You should use the encrypted LDAP version.

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Chapter 21 LDAP server | Contents | 21.2 Global Address (Contact) List