Http to https redirection stopped working (Version 3.0.2)

I have self hosted passbolt ce in my organisation domain. I upgraded to ubuntu 20 package installation of passbolt 2 weeks before. Since yesterday, the website is showing “Welcome to nginx” page. The same happens when I use It only works when you use https for eg:

Has anyone experienced similar issue after upgradation? I didn’t find anything specific in the system logs related to this. The http to https redirection was working before normally. Appreciate your help to fix this. Thank you in advance.