Network Port: 3389
Network Port Reference Guide
Registered Service Name
RDP (Remote Desktop)
Transport Protocol
TCP/UDP
Functional Overview
Port 3389 is used by Microsoft Remote Desktop Protocol (RDP) to enable GUI remote management of Windows hosts.
Security Risks & Vulnerabilities
Extremely high exploit target (e.g. BlueKeep CVE-2019-0708). Exposing 3389 to the public web leads to continuous brute-force attacks and network breaches. Use a VPN or RDP Gateway.
How to audit network port status
1. Scan Open Ports: Use our Port Scanner utility to verify if this port is actively listening on your host.
2. Verify Encryption: Audit the service layer to confirm SSL/TLS is protecting transmission payload.
3. Hardening Rules: Apply the firewall instructions below to shut down unauthorized inbound ports.
UFW Firewall Rules
Allow Command
sudo ufw allow 3389/tcp
Block Command
sudo ufw deny 3389/tcp
iptables Firewall Rules
Allow Command
sudo iptables -A INPUT -p tcp --dport 3389 -j ACCEPT
Block Command
sudo iptables -A INPUT -p tcp --dport 3389 -j DROP