help you fix your problem Found the issue. Heroku wasn't the problem. My database is stored on another server, which probably was hacked. The hosting company detected what appears to be a large flood of traffic from one or more of my servers, that is disrupting the normal traffic flow for other users. To prevent this traffic from causing further disruption, they had disabled the networking interface on the server or servers involved. So that was the problem. My Heroku app wasn't able to connect to my database and so the port binding failed.
Web process failed to bind to $PORT within 90 seconds of launch