How do I install a Sectigo SSL Certificate

Website, Application, Performance Security
1

What is the name of the domain?

What is the error number?

none

What is the error message?

none

What is the issue you’re encountering

I do not know how to install the SSL certificate

What steps have you taken to resolve the issue?

Need help

Was the site working with SSL prior to adding it to Cloudflare?

Yes

What is the current SSL/TLS setting?

Off

What are the steps to reproduce the issue?

None

2

If you are looking to install your own certificate for use on the Cloudflare edge, you need to have a Business or Enterprise plan and follow this guide…

If you just want Cloudflare to use Sectigo as the CA for Cloudflare managed certificates you need to use Advanced Certificate Manager then you can choose the CA from those that Cloudflare uses…

3

Thank you “sjr”, I guess I will have to add Advance Certificate Manager in order to use Sectigo SSL. I see that I have Automatic SSL/TLS FULL now.
Felix

4

Here you can follow an easy step-by-step guide to install Sectigo SSL:

  • Step 1: Generate a CSR (Certificate Signing Request)

If you’re hosting the site yourself (e.g., on cPanel, Plesk, or via a VPS), create a CSR from your hosting control panel.

If using a hosting provider, you may need to contact them or use their SSL tools.

  • Step 2: Submit CSR to Sectigo

After generating the CSR, submit it to Sectigo through their order process.

You’ll receive several certificate files by email once they validate your request (typically a .crt file and a CA bundle).

  • Step 3: Upload and Install the Certificate

For cPanel:

  • Go to SSL/TLS > Manage SSL Sites.
  • Paste your certificate (CRT) and private key (from the CSR generation).
  • Paste the CA Bundle (Sectigo’s intermediate cert).
  • Click Install Certificate.

For Cloudflare Users: Since you mentioned you’re using Cloudflare, the process is slightly different:

  • Go to Cloudflare Dashboard > Select your site.
  • Under SSL/TLS, switch the setting from Off to Full (or Full (Strict) if you installed a valid certificate on your server).

Cloudflare provides a free SSL certificate on their edge, so installing Sectigo SSL on your origin server (host) and setting SSL Mode to Full ensures encryption both between users and Cloudflare, and between Cloudflare and your server.

  • Step 4: Test It

Use SSL checker tool or simply browse your domain to check if the certificate is active.

Ensure your site is being served over https:// and there are no mixed content issues.

5

If I am getting a free SSL from Cloudflare, do I really need a Sectigo SSL?

6

In order to encrypt data between Cloudflare and your origin you need an SSL certificate on your origin in addition to the Cloudlfare edge SSL certificate. See here…

It doesn’t need to be a Sectigo one, you can use a free one from Lets Encrypt or, if you will always use the Cloudflare proxy, a Cloudflare origin certificate…

7

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