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TCP/UDP
Unknown
389 LDAP
LDAP backs identity lookups, directory queries, and authentication workflows across enterprise systems.
Security Context
Port 389 is context-dependent. Its risk depends on the daemon behind it, whether the traffic is encrypted, and how tightly the listener is scoped to trusted networks.
- !Unencrypted LDAP can expose credentials and directory data.
Nmap Check
Use a version probe first so you confirm whether the expected service is really what is listening on this port.
nmap -sS -sU -p 389 <host>Firewall Commands
UFW
sudo ufw allow 389/tcp
sudo ufw allow 389/udpiptables
sudo iptables -A INPUT -p tcp --dport 389 -j ACCEPT
sudo iptables -A INPUT -p udp --dport 389 -j ACCEPT