The port number for the Global Catalog service in Active Directory is TCP port 3268 for standard LDAP queries. For secure LDAP (LDAPS) queries to the Global Catalog, the port used is TCP port 3269. These ports allow clients to perform directory searches across the entire Active Directory forest efficiently
- Port 3268 is used for unencrypted LDAP access to the Global Catalog.
- Port 3269 is used for encrypted LDAP access (LDAPS) to the Global Catalog.
These ports are specific to the Global Catalog and differ from the standard LDAP ports 389 (unencrypted) and 636 (encrypted)
