Thanks Jay.
I was testing few things.
So, I used DigitalOcean’s Discourse marketplace image to create the forum and tested to see everything is working fine.
Then I followed this tutorial - Install Discourse on Ubuntu or Debian for Development and Migrate a vBulletin 4 forum to Discourse for DB migration.
Now can I bind port 3000 to listen to the development application that runs vb DB?
If not, any additional steps necessary?
Many thanks,