# Certificate is not trusted after installation

## Symptoms

<span>After installing certificate you check the website and are presented with an SSL error:  
<span>The certificate is not trusted!</span>  
This means that you are not presented with a full chain of trust of the certificate.  
![mceclip0.png](https://openprovider.help/uploads/images/gallery/2026-08/embedded-image-knrc2fr5.png)  
</span>

## Cause

SSL Certificate chain is incomplete. Some components are missed.  
Use the full root and intermediate certificates when installing the certificate.

## Resolution  


<span>Please use the full root and intermediate certificates when installing the certificate, these can be found in </span>[this knowledge base article](https://openprovider.help/books/ssl-certificates/page/list-of-root-and-intermediate-certificates)<span>.</span>  
You can check your installation on[this website](https://www.ssllabs.com/ssltest/), we use it often as it has a lot of checks that can give you plenty of information about your server's security

Or use[the tool from Sectigo](https://sectigostore.com/ssl-tools/ssl-checker.php), when you are using a Comodo (Sectigo) certificate.