Hello! I have the following problem when I try to share a link without www on Facebook the debugger throws me the following error: "cURL error": 60 (SSL_CACERT): Cannot validate SSL certificate Either it is self-signed (which will cause warnings in the browser) or it is not valid. However, it works if I try it with www (the anti-spam system of the forum does not let me put links) I have installed the Let's Encrypt SSL certificate via ISPConfig, my website works with and without www in all browsers, furthermore I have checked the SSL status on different sites (like SSLLabs.com) for possible errors, but everything is correct. I do not mind using: www, but some of my customers have their websites adapted for configuration without www. I am using ISPConfig 3.2.1 on a Jessie server on Debian 8 with Apache 2.4.10, PHP 7.4.6 and PHP 5.6.3 I hope you can guide me. Thank you very much.