How to properly set up Docker API in VirtualBox?

Question

virtual box

Greetings gentlemen.
Help to understand the following problem:
There is a Windows machine on which VirtualBox is installed, and a virtual machine on Centos 7 is spinning in it.
The network in the machine is configured through the "Virtual Adapter".
Docker is installed on the machine itself and one container is raised with a simple python web application that listens on port 5000 on the machine and, when a request is received, returns a simple html page.
If on a win wheelbarrow to send an http request to ip_vir_machine:5000 it will return the html page as it should.
Docker itself has the "Docker API" enabled. It is enabled using this simple config:

[Service]
ExecStart=
ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2376 -H unix:///var/run/docker.sock

The config itself is located along the path /etc/systemd/system/docker.service.d/remote-api.conf.
If you access api in the virtual machine itself, then it returns a response without problems (curl 0.0.0.0:2376/images/json).
But if he tries to access api http://ip_vir_machine:2376/images/json from win machine, then an error message (time out) takes off.
Can anyone tell me what the problem is and how it can be fixed?

Answer 1

The problem was that port 2376 was closed and the firewall did not let the request through.
After opening the port, everything worked.
Commands to open a port:

firewall-cmd --add-port=2376/tcp
firewall-cmd --add-port=2376/tcp --permanent