I had exactly the same problem.
Confusingly ping was working from the container but e.g. wget and traceroute etc. were not (a good indication of a firewall "problem").
In my set-up the solution was:
ufw allow in to 172.17.0.0/16 proto tcp port 8084
where 172.17.0.1 is the docker0 IP address and 8084 the port on the host machine.
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I had exactly the same problem.
Confusingly ping was working from the container but e.g. wget and traceroute etc. were not (a good indication of a firewall "problem").
In my set-up the solution was:
ufw allow in to 172.17.0.0/16 proto tcp port 8084
where 172.17.0.1 is the docker0 IP address and 8084 the port on the host machine.