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TCP
Vulnerable
135 MS RPC
Microsoft RPC endpoint mapping supports Windows administration and many domain-integrated services.
Security Context
Port 135 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.
- !RPC exposure increases the attack surface on unmanaged Windows hosts.
Nmap Check
Use a version probe first so you confirm whether the expected service is really what is listening on this port.
nmap -sV -p 135 <host>Firewall Commands
UFW
sudo ufw allow 135/tcpiptables
sudo iptables -A INPUT -p tcp --dport 135 -j ACCEPT