How to fix an error with an SSL certificate?

Question

Digital certificates

Hello! There is a certificate issued during domain registration as a gift. It has been installed and all is well. You go to the site from a computer or laptop - everything is fine, but as soon as you go to the site from a mobile phone on android, a certificate error appears, saying that it is unverified. Here is a site , I hope that someone can help with this problem, because I could not find information on this matter, just as I could not figure out how to solve this problem. Thanks in advance.

Answer 1

1. add a chain of certificates
2. disable SSL 3 on the server
3. solve the problems that the test will reveal https://www.ssllabs.com/ssltest/