docker-errors-networking

Use when containers cannot reach each other, DNS resolution fails between services, or published ports are not accessible from the host. Prevents connectivity failures from using the default bridge network, which lacks automatic DNS resolution and proper isolation. Covers DNS failures, connection refused, port mapping issues, iptables conflicts, overlay network problems, subnet collisions. Keywords: docker network, DNS resolution, connection refused, bridge, overlay, iptables, port mapping, docker network inspect, subnet, can't reach container, port not accessible, network error, DNS not resolving.