Running the dockerManageZoa.sh up command fails with a firewall-related error

When you run the dockerManageZoa.sh up command, the following message is displayed:

ERROR: Failed to Setup IP tables: Unable to enable SKIP DNAT rule: (iptables failed: iptables --wait -t nat -I DOCKER -i br-17b3bff776e9 -j RETURN: iptables: No chain/target/match by that name.

This problem is most likely caused by a status change of the firewall daemon that the docker daemon is not aware of. You can resolve the problem by restarting the systemd docker service to force it to reread the firewall status:

sudo systemctl restart docker