Some other guys did the configuration of the DB and now it is internally accessible (using internal IP address 192.168.168.205 I can see the configured moodle main webpage)
However, I need to make it externally accessible. I did the correct SNAT (port-forwarding) on our firewall (Watchguard FireBox M400) and confirmed these settings with the firewall support.
Before making changes in our DNS records with our hosting, I wanted to make sure, that using the public IP address, I could successfully access Moodle. In fact, I could not and the firewall support said that it is not the firewall issue, because it passes the traffic to the moodle host (we did tcpdump on the Ubuntu machine).
Do you have any ideas what is wrong?
Sorry if I missed something.
Ubuntu Server 16.04.3 LTS 64-bit
MySQL Ver 14.14 Distr 5.7.19