Docker "No route to host" what is the problem?

Question

linux

socket connection:

import socket
mysocket = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
host = '0.tcp.ngrok.io'
port = 11111
mysocket.connect((host, port)) #connecting to host

Error:
[Errno 113] No route to host
I tried everything, added rule for firewall but didn't help. You can't disable the firewall because gitlab-runner won't work.

Answer 1

The error has to do with routing, not firewall. Do you have a route to this host or a default gateway capable of sending packets to the right place?