I am unable to map my subdomain with odk central

I have recently installed ODK Central on Ubuntu 20, all the services are up/running but i cannot access it through web.
I have created a sub domain and entered its A records in DNS Zones. I have entered the url of that sub domain in the .env file but the sub-domain is returning "This site can’t be reached" message.
I dont know how to debug it.

DId you update your .env file. You can do that with the help of nano .env


port 443 was blocked, its working fine now. Thanks

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