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First, you need to add a wildcard, A record. Like *.your-domain.com

Install the Ejabberd using the below command

sudo su
apt update
apt upgrade
apt install ejabberd-contrib ejabberd

We need to stop the Ejabberd service to configure the Ejabberd using the below command

systemctl stop ejabberd

Enable UFW port using the below command

ufw allow ssh
ufw allow 80
ufw allow 5443
ufw allow 5222
ufw allow 5223
ufw allow 5269
ufw allow 4369
ufw allow 5280
ufw enable

If your computer already installed Nginx, then you need to redirect 80 ports to 5280 for SSL verification

Please change your Nginx site-available config file like the one below

server {
    listen 80;
    listen [::]:80;
    server_name your-domain.com *.your-domain.com;
    location / {
        proxy_set_header   X-Forwarded-For $remote_addr;
        proxy_set_header   Host $http_host;
        proxy_pass         "http://127.0.0.1:5280";
    }
}

Save the file and restart Nginx using the below command

nginx -t && nginx -s reload

Then edit the `

Then edit the /etc/ejabberd/ejabberd.yml file using the below command

nano /etc/ejabberd/ejabberd.yml

Change host from localhost to your host like the below. Add " before and after domain like the below

hosts:
  - "your-domain.com"

Remove admin access from 5280 port by commenting below a line

    port: 5280
     ip: "::"
     module: ejabberd_http
     #tls: true
     #protocol_options: 'TLS_OPTIONS'
     request_handlers:
      #/admin: ejabberd_web_admin
      /.well-known/acme-challenge: ejabberd_acme

Add admin access to 5443 port using the below changes

    port: 5443
    ip: "::"
    module: ejabberd_http
    tls: true
    protocol_options: 'TLS_OPTIONS'
    request_handlers:
      /admin: ejabberd_web_admin
      /api: mod_http_api
      /bosh: mod_bosh
      ## /captcha: ejabberd_captcha
      ## /upload: mod_http_upload
      /ws: ejabberd_http_ws

Enable an admin account using the below changes

acl:
  admin:
     user:
       - "admin"

Save the file by pressing Ctrl + o then press Enter key then press Ctrl + x

After that, install SSL certification and restart the server using the below command

apt install certbot python3-certbot-nginx
systemctl start ejabberd
ejabberdctl request_certificate all

Register admin account by using the below command

sudo ejabberdctl register <USER> <DOMAIN> <PASS>

Change <USER> <DOMAIN> <PASS> with your user domain password like below

sudo ejabberdctl register admin your-domain.com password

Access the below URL using your browser and login it

https://your-domain.com:5443/admin

If you use MySQL, you need to install the below packages

apt install erlang-p1-mysql