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TCP/UDP
Vulnerable
111 RPCbind
RPCbind maps ONC RPC services to dynamic ports and often appears on Unix and NFS-heavy networks.
Security Context
Port 111 is high-risk when broadly exposed. Treat it as an attack-surface decision, not just a connectivity setting, and confirm whether the listener truly needs to be reachable.
- !Exposed RPC services broaden reconnaissance and lateral-movement surface area.
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 111 <host>Firewall Commands
UFW
sudo ufw allow 111/tcp
sudo ufw allow 111/udpiptables
sudo iptables -A INPUT -p tcp --dport 111 -j ACCEPT
sudo iptables -A INPUT -p udp --dport 111 -j ACCEPT