Portscan

Application

With the Portscan function, the control checks all open, incoming TCP and UDP listen ports at defined intervals or when commanded. The control shows a message if a port is not listed.

Description of function

The Portscan menu item opens the Portscan window. The menu item is in the Diagnostics/Maintenance group of the Settings application.

  • The control searches for all open, incoming TCP and UDP listen ports on the system and compares them to the following whitelists:
  • System-internal whitelists /etc/sysconfig/portscan-whitelist.cfg and /mnt/sys/etc/sysconfig/portscan-whitelist.cfg
  • Whitelist for ports with machine-manufacturer-specific functions: /mnt/plc/etc/sysconfig/portscan-whitelist.cfg
  • Whitelist for ports with customer-specific functions: /mnt/tnc/etc/sysconfig/portscan-whitelist.cfg
  • Each whitelist contains the following information:
  • Port type (TCP/UDP)
  • Port number
  • Offering program
  • Comments (optional)

In the Manual Execution area, use the Start button to start the portscan manually. Use the Automatic update on function of the Automatic Execution to have the control automatically perform the portscan at a defined interval. You define the interval with a slider.

If the control performs the portscan automatically, then only ports listed in the whitelists my be open. The control shows a message window if a port is not listed.