The port 443 being used by another application' issue during installation of orchestrator

How to fix "The port 443 being used by another application" issue during installation of orchestrator

By default, port 443 is used by orchestrator web application to communicate over https.

In case the port 443 is not open or being used already by another application, orchestrator installation will fail.

To determine the status of the port, run from command line with elevated rights the following command:

netstat -an | find "443"

We can also try to telnet from some other machine to the server where we want to install orchestrator by running telnet host port  to see if the connection is refused, accepted, or timeouts.
  • Connection refused means that nothing is running on that port
  • Accepted means that something is running on that port
  • Timeout means that a firewall is blocking access

In case 'telnet' is not recognized as an internal or external command, operable program or batch file. To solve this, just enable it: Click Start > Control Panel > Programs > Turn Windows Features on or off. In the list, scroll down and select Telnet Client and click OK.

If port 443 is used by another application, choose a different HTTPS port for Orchestrator and make sure that the port is open.

In case the port is blocked by firewall, we will have to change the firewall settings and allow the port with the help of IT team.