My Private Space app refuses connections to port 443

Issue

I have a Private Space app that no longer responds to HTTPS requests.

$ curl https://example-app-name.herokuapp.com/             
curl: (7) Failed to connect to example-app-name.herokuapp.com port 443: Connection refused

How can I regain access to the app through port 443?

Resolution

Please have at least one web dyno running and upload the SSL server certificate again or Automated Certificate Management. This should trigger the platform to enable connections to port 443 in a couple of minutes.