Can't launch Rocket Chat?

Question

MongoDB

I'm trying to raise a chat inside a small company, but I can't.
Of all the instructions that I found, this one turned out to be working .
But as a result, it issued 502 Bad Gateway

Who can tell you how to install Rocket Chat, they write on the Internet that it is easy because it is installed from the Snap package. In fact, I was tormented and killed 5 hours on a total of 502 ....

* snap.rocketchat-server.rocketchat-server.service - Service for snap applicati>
Loaded: loaded (/etc/systemd/system/snap.rocketchat-server.rocketchat-serv>
Active: active (running) since Sat 2021-09 -25 14:15:24 CEST;29s ago
Main PID: 11349 (startRocketChat)
Tasks: 12 (limit: 805)
Memory: 476.5M
CGroup: /system.slice/snap.rocketchat-server.rocketchat-server.service
|- 11349 /bin/bash /snap/rocketchat-server/1484/bin/startRocketChat
`-11416 node /snap/rocketchat-server/1484/main.js

Sep 25 14:15:25 92567 rocketchat-server.rocketchat-server[11373 ]: MongoDB shell>
Sep 25 14:15:25 92567 rocketchat-server.rocketchat-server[11373]: connecting to>
Sep 25 14:15:25 92567 rocketchat-server.rocketchat-server[11373]: Implicit sess>
Sep 25 14:15:25 92567 rocketchat-server.rocketchat-server[11373]: MongoDB serve>
Sep 25 14:15: 25 92567 rocketchat-server.rocketchat-server[11349]: Checking if m>
Sep 25 14:15:38 92567 rocketchat-server.rocketchat-server[11416]: LocalStore: s>
Sep 25 14:15:38 92567 rocketchat- server.rocketchat-server[11416]: LocalStore: s>
Sep 25 14:15:38 92567 rocketchat-server.rocketchat-server[11416]: LocalStore: s>
Sep 25 14:15:38 92567 rocketchat-server.rocketchat- server[11416]: Setting defau>
Sep 25 14:15:52 92567 rocketchat-server.rocketchat-server[11416]: {"line":"120">
lines 1-20/20 (END)

Answer 1

show here the output of the command

sudo systemctl status snap.rocketchat-server.rocketchat-server.service

Copy-paste from ssh.

Answer 2

look who is still sitting on the port
, there may be 2 programs and interfere together,
and between us it is better to start from the official page
https://docs.rocket.chat/installing-and-updating/m...

Answer 3

Show people more:
sudo ss -atnlp
sudo snap services