Issue Docker containers can not connect to each other

[Jess Stopa]

I am running several docker containers on different ports, using manual port mapping. I can connect to all of them from the host and from my local machine. But the containers can not communicate with one another. I have tried with domain, IP and container name, but nothing will let them connect.
I have also tried using different ports, and while I can confirm it is working from host to container, there is no connection from one container to another.

 

[Jess Stopa]

I'm using Plesk Onyx

 

[CrisR]

@Jess Stopa Yeah, the docker extension in plesk is what you'd describe as "garbage"
Not sure how that thing ended up in production
Yes, I am aware my comment is not nice. The extension is really really poorly made.
And they should feel bad!