![]() ![]() The root cause is older tutorials for configuration of webservers that served the cert.pem file (because it worked) rather than the fullchain.pem file which makes sure a browser gets the full chain needed to validate the certificate. This problem is popping up all over the place, including with both small and large websites. Then refresh your server's configuration. ![]() Lines like that need to be replaced by lines like this ssl_certificate /usr/local/etc/letsencrypt/live//fullchain.pem I'm using nginx configuration style for this example: ssl_certificate /usr/local/etc/letsencrypt/live//cert.pem Your certificate is likely not invalid at all.
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