Everything was working fine till I was on my old server. After migrating it to a new server with same configuration (better memory and added load balancer), when I try saving the theme from the theme page http://mysite.com/admin/build/themes, after waiting for some time I get a 504 Gateway Timeout error from nginx.
Hope I get some response here and the experts can help me resolve this question.
I just noticed if I perform any postback operation that is related to Drupal core modules, the issue is present. I am able to add/edit/delete data and do postbacks on admin pages that are created via a custom module, but the page just does nto work when on Core Druapl admin pages -
- Save Theme
- Clear Cache
- Add Node