A network administrator is creating a firewall rule for a legacy application that performs plain LDAP directory lookups (no SSL/TLS) against an on-premises Active Directory domain controller. Which inbound TCP port must be opened so the application can successfully query the directory service?
TCP 445
TCP 389
TCP 636
TCP 3268
Lightweight Directory Access Protocol (LDAP) uses TCP (and UDP) port 389 for unencrypted directory queries. Port 636 is used for LDAP over SSL/TLS (LDAPS), 3268 is for Global Catalog lookups, and 445 is used by SMB, not LDAP. Therefore, permitting TCP 389 allows the required plain-text LDAP traffic to reach the domain controller, while the other ports would not satisfy the application's needs.
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