Yes, but my server was not configured with the port 443 (only the 22 (SSH) and 80 (HTTP) ports were open. I installed my discourse, with no problem, except that the 443 (HTTPS) port was not available. So I couldn’t use it in the Discourse app, by exemple.
To have the full accessibility and more security, I tried to open my port 443 in the server, and I moved the default port of my ubuntu server from 80 to 443, to have the https (I find it quite logic).
But when I went to the server port 443, this message was shown, in the place of my Discourse. I decided to change the settings of the discourse to check if let’s encypt could access to my server to run a certificate. The settings said me that the server was not available in the port 443 , but that my port 80 was still open (message with good DNS settings, so).
So I tried to edit the default nginx port to 80 (the previous settings, so), to get again my discourse.
But I have always the same Nginx page… So how could I get again my Discourse ?