Synology NAS Quick Tip – Scanning Ports on your NAS using Windows 10

While we were configuring the Firewall on our Synology NAS. We found it useful to have a quick way to check if ports that we were working with were open or closed.

So built into Windows PowerShell is a command called Test Net Connection (TNC), which is a free way to check the state of our firewall. Please note that TNC does have limitations but seems to work well when checking if a single port on our NAS is open or closed.

Quick reference notes:

  • From the desktop of Windows 10, select Search
  • Within the search field enter Powershell
  • Now from the command prompt of Powershell enter the following:
    tnc <ip address of NAS> -port <the port to be tested>
  • When you press enter on your keyboard the test will run.

Notes: While you can test a range of port numbers, for example ports between 150 and 200. As most of those ports will be closed, you will have to wait for the TNC command to time-out for each port. As the test for each closed port will take roughly 70 seconds. If you test a range of ports, it will take a considerable amount of time.

If you need to test the whole firewall on your NAS, or you wish to test a range of ports. It would be more time efficient to use a full network scanning application.

Reference materials:

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