can not see the shiny server welcome page in the browser

Dear all,

I follower the below steps to set up shiny server in Ubuntu 18.04.

  1. installed R, and shiny R
  2. installed R package like rmarkdown
  3. installed firewall: sudo apt-get install firewalld
  4. starte firewall: sudo systemctl start firewalld
    sudo systemctl enable firewalld
    sudo systemctl status firewalld
  5. Modify the firewall rules: sudo firewall-cmd --permanent --zone=public --add-port=3838/tcp
    sudo firewall-cmd --reload
  6. When I input my localhost:3838 in the browser, there shows the error like "The site can not be reached". But I checked the server, there already exists the hello app under the folder /srv/shiny-server/sample-apps/.
    Is there anyone can help with this?
    Thank you.
    Best regards

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