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 http://passbolt.domain.com. It only works when you use https for eg: https://passbolt.domain.com.

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.

Regards,
Yogesh