6000
X11 (X Window System)
Critical RiskTCP — Remote Access
Port Overview
Port Number
6000
Service Name
X11 (X Window System)
Transport Protocol
TCP
Category
Remote Access
Security Risk
Critical
Port Range
Registered (1024-49151)
What is Port 6000?
Port 6000 is the base port for X11 (X Window System), the display server protocol used in Unix/Linux graphical environments. X11 display :0 uses port 6000, with subsequent displays using 6001, 6002, etc. Exposing X11 ports over a network without strong authentication (xhost) is a severe security risk allowing screen capture and input injection.
TCP
Remote Access
Security Considerations
Port 6000 (X11 (X Window System)) is classified as critical risk. This port should not be exposed to the public internet. The service transmits data without encryption, making it vulnerable to eavesdropping, credential theft, and man-in-the-middle attacks.
Recommendation: Block this port at the firewall. Use encrypted alternatives (SSH, SFTP, HTTPS) instead.