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UDP
Unknown
67 DHCP Server
DHCP servers assign IP leases and hand out network configuration to clients on boot.
Security Context
Port 67 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.
Nmap Check
Use a version probe first so you confirm whether the expected service is really what is listening on this port.
nmap -sU -p 67 <host>Firewall Commands
UFW
sudo ufw allow 67/udpiptables
sudo iptables -A INPUT -p udp --dport 67 -j ACCEPT