Oct 26, 2018 · Catiewong, if you are talking about an external firewall, you can certainly ask the firewall admins if that port is open. However, if you don't have anything listening on your server on port 443, then testing is meaningless. The port might be open on the firewall, but your test will fail if nothing is listening.
check if port is open - YouTube Oct 27, 2015 Testing if a Port is Open With PowerShell - Centino Nov 20, 2018 How to Find Open and Blocked TCP/UDP Ports
Testing the port status for the computer inside a subnet is only possible with port forwarding. Also, please note that in case you are testing open port for your local IP address i.e. if your Ip is similar to 192.168.1.xxx you are trying to check open port on internal IP and it is not going to work.
May 31, 2018
How to Find Open and Blocked TCP/UDP Ports
What is port 443? - Open Port Check Tool - Open Port May 19, 2020