Port 5900 — VNC

TCP · Port 5900/TCP is used for Remote Frame Buffer (RFB) protocol, a remote desktop access service. It allows users to remotely control and view the graphical user interface of another computer using VNC (Virtual Network Computing). This port is commonly used in virtual private networks (VPNs) and cloud computing environments.

Port Number: 5900
Service Name: VNC
Protocol: TCP
Common Software: TigerVNC, RealVNC, LibVNCServer

Security Notes

Review IANA registry for port 5900 usage. Apply principle of least privilege - only open ports that are required.

FAQ

What is port 5900 used for?

Port 5900 is used for VNC. Port 5900/TCP is used for Remote Frame Buffer (RFB) protocol, a remote desktop access service. It allows users to remotely control and view the graphical user interface of another computer using VNC (Virtual Network Computing). This port is commonly used in virtual private networks (VPNs) and cloud computing environments. Common software: TigerVNC, RealVNC, LibVNCServer.

Is port 5900 dangerous to leave open?

Review IANA registry for port 5900 usage. Apply principle of least privilege - only open ports that are required.

How do I check if port 5900 is open?

Use nmap: nmap -p 5900 <target> or check locally: ss -tlnp | rg 5900