I had to remove the SSL certificate from a Private Space app and the app now refuses to accept requests through HTTPS:
$ curl -v https://(app-name).herokuapp.com/ * connect to the IP address port 443 failed: Connection refused * Failed to connect to (app-name).herokuapp.com port 443: Connection refused * Closing connection 0 curl: (7) Failed to connect to (app-name).herokuapp.com port 443: Connection refused
I need to have access to the default domain through HTTPS restored.
There is actually a procedure on Heroku API missing when an SSL server certificate is removed from a Private Space app. That has caused the app to receive network connections at port 443. Our engineers are aware of the problem and are working for a fix.
In the meantime, the problem maybe able to be fixed for a publicly accessible app with enabling ACM
heroku certs:auto:enable and disabling it again