WordPress: cURL error 60: SSL certificate problem via Really Simple SSL

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My domain is: stopford.com

I ran this command: Checked Really Simple SSL's open tasks

It produced this output: The mixed content fixer could not be detected due to a cURL error: cURL error 60: SSL certificate problem: certificate has expired . cURL errors are often caused by an outdated version of PHP or cURL and don't affect the front-end of your site. Contact your hosting provider for a fix.

My web server is (include version): Linux

The operating system my web server runs on is (include version): Linux

My hosting provider, if applicable, is: TSO Host

I can login to a root shell on my machine (yes or no, or I don't know): I don't know

I'm using a control panel to manage my site (no, or provide the name and version of the control panel): WordPress 5.81

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot):

Wordpress seems to use its own certificate bundle, which is located in wp-includes/certificates/ca-bundle.crt. Replace this file with the latest one, you can get it from the curl website: curl - Extract CA Certs from Mozilla

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While you're updating...
Make sure the rest of the system also has the latest ca-certificates update.