Mattermost's site cannnot be reached


After enabling Mattermost on Nethserver, I could not access the server from the web. I am getting the following error on the browser:

chat.mydomain.local’s DNS address could not be found. Diagnosing the problem.

systemctl status mattermost provides the following output:

Any idea?

Did you create a public DNS record pointing to your NethServer? chat.mydomain.local seems a local domain name not resolvable by public DNS. That’s the reason it does not work from the web.

From documentation:

Before proceeding with the configuration, make sure to create the corresponding DNS record. If NethServer act as the DNS server of your LAN, please refer to DNS.