What is errno 99?
Docker container [Errno 99] Cannot assign requested address Note that for Docker containers, either you need to run them in network_mode: host to use the host’s network systemd, or you need to bind to the container’s IP address. But you can forward the ports from the host, binding to a specific IP address.
Could not bind udp socket error 99?
99 is EADDRNOTAVAIL. Which means (from man bind(2)): A nonexistent interface was requested or the requested address was not local. Maybe the SERVER_IP is not IP of your host.
