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Generally this means that the certificate on your server doesn't match the DNS name for that server. Or that the certificate isn't signed by an authority that the browser recognises - this could be because it is a self-signed certificate. There's more information available when you click "Show Details" which should identify the cause.
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Hi,
Thanks for using Lightsail. I'm adding a doc which may help you with this process.
https://lightsail.aws.amazon.com/ls/docs/en_us/articles/verify-tls-ssl-certificate-using-dns-cname-https https://lightsail.aws.amazon.com/ls/docs/en_us/articles/amazon-lightsail-tutorial-launching-and-configuring-wordpress#tutorial-launching-and-configuring-wordpress-creating-a-dns-zone
con risposta 3 anni fa
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- AWS UFFICIALEAggiornata 3 anni fa

Websites prove their identity via certificates. Firefox does not trust this site because it uses a certificate that is not valid for www.nobody.chat. The certificate is only valid for nobody.chat.
Error code: SSL_ERROR_BAD_CERT_DOMAIN
The DNS matches the domain name from what I can see so I don't know what the issue is...
But the DNS name doesn't match the certificate name. The certificate is for
nobody.chatwhereas the DNS name being used iswww.nobody.chat- they aren't the same.