One of WordPress default cURL SSL certificates has expired. You can use cURL SSL Certificate Manager Setup page to fix the cURL error 60 problem.
SSL certificate manager will install newest cURL SSL certificate for WordPress and fix the cURL Error 60 SSL certificate problem that certificate has expired.
You can keep update this plugin to get newest cURL SSL certificate and avoid system migration work.
Overview
SSL Certificate Manager enables you to:
- Use Newest cURL SSL Certificate. (Recommend!)
- Keep Default WordPress Certificate.
- Disable WordPress cURL SSL Certificate Verify. (Not recommend and not the best for security)