Hi, I was about to set up Discourse when this came up:
Error response from daemon: driver failed programming external connectivity on endpoint app (8906210b0187ffe2469c0b4abd9dad9a7f70b2e3b7f0a902dd9f8f05f22f29d1): (iptables failed: iptables --wait -t nat -A DOCKER -p tcp -d 0/0 --dport 443 -j DNAT --to-destination 172.17.0.2:443 ! -i docker0: iptables: No chain/target/match by that name.