The Intermediate CA has not been installed. You need to install the relevant Intermediate CA.
This occurs when you are attempting to configure your order using a wildcard domain such as *.example.com but your order is not for a wildcard certificate.
This error occurs when you try to paste your CSR request into the enrolment form.
In brief the attack could potentially allow the connection to be downgraded to 512-bit which is crackable. Browser vendors are deploying updates to prevent downgrades beyond 1024-bit.
This issue occurs because IIS Manager performs a lookup operation to look for a friendly name of the certificate during the installation.
Error produced by Firefox when visiting website secured by a no longer trusted certificate.
This error usually occurs because the website content contains both secure and insecure content. To resolve this issue make sure that the page code does not pull data directly from a non-secure URL.
This error occurs when the CSR request has been generated using IIS7
Windows does not allow .well-known folder. It is possible to FTP into your website and create the folder. You can also create the folder using the terminal mkdir command on windows.
This error usually occurs because the website content contains both secure and insecure content.