LDAP uses port 389 for encrypted traffic.
port 389
The default port for LDAP (Lightweight Directory Access Protocol) is 389. For secure LDAP connections using SSL/TLS, the default port is 636. These ports are used for directory services and enable applications to access and manage directory information over a network.
TCP port 389 is commonly used for Lightweight Directory Access Protocol (LDAP)
port 636
The client IP address, the clients host name, the port address to use during communication
A LDAP query is a configurable search used to gather information from your directory server. It can be used to test whether certain data exists on the server.
Softera offers the LDAP brower as lightweight version of the Softera LDAP Administrator, as a free download. the LDAP browser does not allow to modify the LDAP directories by the users.
1-LDAP Port Conflict may Occured 2-Overload 3-Redundancy
slapd
The following are some online sources where one can find online information about LDAP; How LDAP works on Person highered site, How to write LDAP search filter on Atlassion documentation, and An introduction to LDAP on Idapman website.
The standard port numbers for the specified protocols are as follows: SMTP (Simple Mail Transfer Protocol) uses port 25, POP3 (Post Office Protocol version 3) uses port 110, IMAP4 (Internet Message Access Protocol version 4) uses port 143, RPC (Remote Procedure Call) commonly uses port 135, LDAP (Lightweight Directory Access Protocol) operates on port 389, and the Global Catalog service typically uses port 3268. These ports facilitate various email and directory services in network communications.