Is it not possible to connect this out of localhost?

[lahfir]

I have deployed my flask server as a bridge on Heroku that I'm trying to use as a communication bridge between a master EA and multiple slave EAs. This is working if it's on the same system but when I try to connect to the Heroku deployed URL, the connection is not being established.

[nuric]

Can you describe more what is running where? The server should listen on open ports but sounds like you might have a firewall blocking incoming requests instead.