A nice tool that you can use is Microsoft’s free PortQueryUI. It provides a GUI for the portqry.exe command-line tool, which is installed by default on recent Windows OS versions.
- Run portqueryui.exe.
- In the Port Query dialog box, enter the destination IP address or Fully Qualified Domain Name(FQDN) to query. In this case, you can enter 127.0.0.1 or localhost.
- Select Manually input query ports and type 443 in the Ports to query field. (By default, TCP is selected in the Protocol drop-down list).
- Click the Query button. The status of port 443 is displayed in the bottom pane of the Port Query dialog box.