Gateway timeout Error on previewing form on web

1. What is the problem? Be very detailed.

When previewing a form on web (even a basic form with 2 variables) I get a gateway timeout error. I can access the form on mobile and submit data but it just won't work with web

2. What app or server are you using and on what device and operating system? Include version numbers.

Ubuntu 20.0.4

3. What you have you tried to fix the problem?

Deployed Central on a new VM, still getting the same error

My environment is virtual. I have increased the RAM to 16 GB, run the installation on a separate VM but still get the same error

4. What steps can we take to reproduce the problem?

Load my public form on the following URL

5. Anything else we should know or have? If you have a test form or screenshots or logs, attach below.