VNC ports range, how to block VNC in network?

Support: WFilter zh.4.1, WFilter en.4.1, WFilter Free 1.0, WFilter ROS 1.0
  Author: Alice ModifyTime: 2018-03-18 10:31:44  
      VNC is a remote control protocol.  

This protocol is official supported. You can install it in "System Settings"->"Protocols" of WFilter.


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"VNC" uses TCP protocol for communication.

TCP traffic analysis

Ports Range

Dynamic ports, no fixed port found.

How to block VNC?

  • Setup a content filter(ie: WFilter), which can block VNC via signature matching.

VNC v2.0(2018-03-18 10:31:44)

● add NGF support

VNC v1.0(2013-04-28 05:28:56)

● TightVNC_en