Resolved PowerPress Verification Error: Connection Refused

[ten.iclica]

Hi.

I have Plesk Obsidian on my Ubuntu server hosted by Digitalocean. I am getting this "connection refused" error during verification of my podcast mp3 file on my site.

Error: Failed to connect to [domain] port 443: Connection refused

Output for command on my terminal:
curl -I "url"

HTTP/2 200
server: nginx
date: Thu, 10 Dec 2020 16:20:48 GMT
content-type: audio/mpeg
content-length: 12528763
last-modified: Wed, 09 Dec 2020 21:15:03 GMT
etag: "5fd13e57-bf2c7b"
x-powered-by: PleskLin
accept-ranges: bytes

Output for command on my terminal:
curl -i -r "url"

HTTP/2 206
server: nginx
date: Thu, 10 Dec 2020 16:22:18 GMT
content-type: audio/mpeg
content-length: 100
last-modified: Wed, 09 Dec 2020 21:15:03 GMT
etag: "5fd13e57-bf2c7b"
x-powered-by: PleskLin
content-range: bytes 0-99/12528763

I have tried disabling firewall and disabling fail2ban but the result is same, I still got connection refused error.
Previously I was using my server without Plesk (or any Plesk like software) and there was no error while podcast verification on PowerPress.

Thanks.

 

[ten.iclica]

I solved this issue by editing /etc/hosts file. I changed 127.0.1.1 "machine-name" line with 127.0.1.1 "server IP". But I wonder why this change solved my problem?