The main web application on port 80 was running on
sysadmin account in application. I changed identity to
Domain user account. Added that user to
admin databases as
db owner and
From that onward website is displaying
Cannot connect to the configuration database.
domain user into farm admin group also. Still did not worked.
I changed back to
sysadmin account and working fine. But I don't want use sysadmin account.