In case the problem is iptables, you can disable iptables for docker by adding the option "--iptables=false" in the DOCKER_OPTS in /etc/sysconfig/docker. Have in mind thought that this will disable some networking functions within docker. Thus, if you disable iptables, you will want to append the docker iptables rules to your iptables configuration. More info at: https://docs.docker.com/engine/userguide/networking/#docker-and-iptables