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Accepted Answer
Try this tutorial: https://www.digitalocean.com/community/tutorials/how-to-secure-apache-with-let-s-encrypt-on-ubuntu-16-04 . Be sure to back’up apache config files before you do just in case.
Hey…thankyou for your answer.I re did this but my website still has the same issues.
The error that I see now is ERR_CERT_COMMON_NAME_INVALID
what should I do.
regards Chhavi
Try opening the site and then examining the certificate on the browser.(Normally by clicking on the little padlock, :-) The Common Name should be the same as the exact web site domain to which you are connecting. In the case of this page where I am posting the certificate common name is www.digitalocean.com.
You can check the ssl status if your site by searching google for “Test if my site certificate is ok” You should find some sites where you can type in your domain and it will report on your certificate status (And usually try to sell you a new one! :-)