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How to fix certificate error on trusted website

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Hello, I just recently started getting the error message Error code: SSL_ERROR_BAD_CERT_DOMAIN on a trusted website (dragcave.net). The funny thing is, I can still access this website by deleting "www" from the beginning or using a browser to find the site and enter it from there. I've had this problem on other versions of Firefox and was able to simply add the website to the list of trusted sites and thereby access it easily, but when I tried this method it doesn't work.

I've restarted Firefox, uninstalled and reinstalled it, have not changed anything with my antivirus in the last several months, or done anything new. Why am I getting this error message when I can still access the website via other ways and how can I fix it if it happens to other websites?

Hello, I just recently started getting the error message Error code: SSL_ERROR_BAD_CERT_DOMAIN on a trusted website (dragcave.net). The funny thing is, I can still access this website by deleting "www" from the beginning or using a browser to find the site and enter it from there. I've had this problem on other versions of Firefox and was able to simply add the website to the list of trusted sites and thereby access it easily, but when I tried this method it doesn't work. I've restarted Firefox, uninstalled and reinstalled it, have not changed anything with my antivirus in the last several months, or done anything new. Why am I getting this error message when I can still access the website via other ways and how can I fix it if it happens to other websites?

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Asịsa Ahọpụtara

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Why do you want to use the link with the "www" prefix when it looks that you can only access this website securely without this prefix?

www.dragcave.net uses an invalid security certificate.

The certificate is only valid for the following names:
  dcave.net, dragcave.net, static.dcave.net, static.dragcave.net