Finally I've solved the problem.
I think my UBOS staff did not seem to work properly at that time, I know it's a pretty good tool, but for me it made the situation a bit more complicated.(I've also learnt manual editing of Site JSON without knowledge containing somewhat risks)
After re-installing all the UBOS on the box, this problem(missing certi file) has gone, and in this time I just followed every steps of your advice to set up my site with tls implemented.(please note my site block was caused by the firewall located on my router)
Thank you j12t , without your support I can not make my first success ever!