I don’t think it will help but you may try edit the port and restart the services. We have to find out why the port 8082 is not open.
To open another port in firewall: http://docs.nethserver.org/projects/nethserver-devel/en/v7/services.html#add-a-new-network-service
EDIT:
You may check iptables for port 8082 with following command:
iptables -S | grep 8082