How to connect ssl certificate to work via mobile internet?

Question

Digital certificates

I connected the ssl certificate that came as a gift with reg.ru hosting to my site, everything worked. There was a lock, it would seem - everything is fine. But there was a problem - it does not come from the mobile Internet (3G / 4G). SAfari writes: Safari cannot open the page because it cloud not estabilish a secure connection to the server. If you go to the site with wi-fi everything works fine. Help, I don't know what to do!

Answer 1

Install Lets Encrypt and don't worry, it's done in two clicks in ISP Manager