Unable to view forge jira app in browser post tunneling

Created an Single Page Admin App.

forge tunnel
Tunnel redirects requests you make to your local machine. This occurs for any Atlassian site where your app is installed in the specific development environment. You will not see requests from other users.
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Checking Docker image... 100%
Your Docker image is up to date.

=== Running forge lint...
No issues found.

=== Bundling code...
✔ Functions bundled.

=== Snapshotting functions...
No log output.

Listening for requests...
Received proxy request. Serving file index.html for resource main from specified address http://localhost:3000

Error: Failed to connect to localhost:3000. Check that your service is running.

Hi @SaravananKulanthaive,

This can happen if you built a Custom UI app and defined a tunnel port in your manifest.yml, but forgot to start your dev server when tunneling.

For example, if you added this to your manifest

  - key: main
    path: static/my-app/build
      port: 3000

After (or before, either should work) running forge tunnel, you need to start your dev server by running npm start in static/my-app on a separate terminal/console. This should help solve this error.

Try it out and let us know how it goes.

Check this page for more information about tunneling (covers Custom UI).