Opening a port to an application accessible outside of localhost?

I’ve seen this question asked a million times before, but I’ve never seen a satisfactory answer. “All ports are open by default.” is not helpful.

* Running on (Press CTRL+C to quit)

lsof -i :5000 yields

python  11824 root    3u  IPv4 10213572      0t0  TCP localhost:5000 (LISTEN)

But it doesn’t work. I have this working on localhost, but it just won’t work over the internet. shows that the port is closed.

Does anyone have any advice?

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Your program is listening on, the loopback interface, which mean that it’s only accessible from the Droplet itself. In order to be able to access it externally, you will need to configure it to bind to instead.