Choosing Unique Port Numbers (System Administration Guide: Naming and Directory Services (DNS, NIS, and LDAP))

System Administration Guide: Naming and Directory Services (DNS, NIS, and LDAP)

Choosing Unique Port Numbers

Port numbers can be any number from 1 to 65535. Keep the following in mind when choosing a port number for your iPlanet Directory Server 5.1.

The standard iPlanet Directory Server 5.1 (LDAP) port number is 389.
Port 636 is reserved for LDAP over SSL. Therefore, do not use port number 636 for your standard LDAP configuration, even if 636 is not already in use. You can also use LDAP over TLS on the standard LDAP port.
Port numbers between 1 and 1024 have been assigned to various services by the Internet Assigned Numbers Authority. Do not use port numbers below 1024 other than 389 or 636 for directory services as they will conflict with other services. Additionally, port numbers below 1024 are accessible by root only.
iPlanet Directory Server 5.1 must run as root using either port 389 or 636.
Make sure the ports you choose are not already in use. Additionally, if you are using both LDAP and LDAPS communications, make sure the port numbers chosen for these two types of access are not identical.

Note –

If the LDAP naming service clients are using SSL encryption, you must use the default port numbers 389 and 636, so that the server runs as root. See Transport Layer Security (TLS) for information on Transport Layer Security.

For information on how to set up LDAP over SSL (LDAPS) for the iPlanet Directory Server 5.1, see the iPlanet Directory Server 5.1 Administrator's Guide.