3389
RDP
High RiskTCP/UDP — Remote Access
Port Overview
Port Number
3389
Service Name
RDP
Transport Protocol
TCP/UDP
Category
Remote Access
Security Risk
High
Port Range
Registered (1024-49151)
What is Port 3389?
Remote Desktop Protocol. Provides graphical remote access to Windows desktops and servers. A primary target for brute-force attacks and ransomware delivery.
TCP/UDP
Remote Access
Commonly Used
Security Considerations
Port 3389 (RDP) is classified as high risk. This port is a common target for automated scanning and brute-force attacks. If you must expose it, restrict access to known IP addresses.
Recommendation: Use firewall rules to whitelist trusted IPs. Enable rate limiting and intrusion detection.