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ufw and docker problems
It appears that ufw and docker do not work well together out of the box. This is a common enough problem that we should have some general advice on it.
Related link (which doesn't have any easy answers): https://stackoverflow.com/questions/30383845/what-is-the-best-practice-of-docker-ufw-under-ubuntu
Comment from @zhyatt:
From a related note: One solution I found for easy docker setups was in the docker daemon setting {"iptables": false} to disable the docker override. As long as you then explicitly allow 7075 on ufw the node works well.