Help: Open Ports
 
Introduction The open ports table is for reference only. It lists the currently open TCP and UDP ports on this machine. This listing might be of some use in determining which ports need to be firewalled.
Set up The open ports list is obtained by dynamically scanning your machine for ports, using netstat -a.

You can't edit this list yourself. If there is a port that is open that should not be open, then you need to stop the service that has that port open. Use the "ntsysv" program on Red Hat Linux to see what services are started on boot up.


What do the
colours mean?
Different services are colour coded to enable them to be identified more easily. The colour codes are:

TCP Services:

  • Low numbered ports are magenta. These ports usually relate to privileged TCP services (eg: WWW servers).
  • High numbered ports are dull yellow. These ports usually relate to unprivileged TCP services (eg: proxy servers).
UDP Services:

  • Low numbered ports are red. These ports usually relate to privileged UDP services (eg: DNS).
  • High numbered ports are cyan. These ports usually relate to unprivileged UDP services (eg: RADIUS).
Other services are blue. These usually relate to ICMP, DDP, GRE, and other protocols.