https://devcenter.heroku.com/articles/setting-the-http-port-for-java-applications

这是为Java应用程序编写的，但它适用于Heroku上托管的任何Web应用程序.当您运行Web Worker时，必须将端口绑定到环境变量 $ PORT .您无法指定自定义端口.

this is written for java application but it applies to any web application hosted on Heroku. When you are running a web worker you have to bind the port to the environment variable $PORT. You cannot specify a custom port.

绑定到正确的端口后，这些错误应消失:

Once you bound to the proper port these error should vanish:

Unhandled Exception: System.Net.Sockets.SocketException: Permission denied

然后您的应用程序可能会运行，或者您可能遇到其他错误.如果您以后遇到其他问题，请创建一个新问题.

Your application might then work or you might be experiencing different errors. If you are experiencing later a different issue please create a new question.