In order for an SSL/TLS Certificate to work properly, so that your website content would be shown on all devices and browsers using HTTPS, without any problems, you need to use an SSL Certificate Trust Chain instead of a simple certificate.
Requirements
To create a certificate trust chain, you will need an Intermediate Certificate as well as a Root Certificate. The Root Certificate and the intermediate certificate are provided to you by your SSL/TLS certificate provider. In case you do not have access to these files, you can simply download the from the company’s website that issued your certificate.
How to Create the SSL Certificate Trust Chain
You can simply use a text editor like vim or notepad to create the trust chain file. You then need to use the following commands to create a file including the website certificate, root certificate, and intermediate certificate.
——BEGIN CERTIFICATE——
(Your Primary SSL certificate: yourwebsite.crt)
——END CERTIFICATE——
——BEGIN CERTIFICATE——
(Your Intermediate certificate: INTERMEDIATE.crt)
——END CERTIFICATE——
——BEGIN CERTIFICATE——
(Your Root certificate: Root.crt)
——END CERTIFICATE—–