These browsers appear to only require the initial SSL Server Certificate and the Root Certificate Authority Certificate. Google Chrome and Microsoft Internet Explorer appear to not require the Intermediate Certificates in the SSL Chain. This works in most cases, where the issue is originated due to a system corruption. The missing Intermediate Certificates may be the RSA Domain Validation Secure Server Certificate and the RSA Certification Authority Certificate. Fix: Your Connection is not Secure Firefox If the issue is with your Computer or a Laptop you should try using Restoro which can scan the repositories and replace corrupt and missing files. There are numerous reasons for encountering the message: 'This connection is untrusted.' However, you may find the issue is due to missing Intermediate Certificates in the SSL Chain. I had to resolve the issue by deleting the certificate entirely both CRT and Activation and then re-installing the Certificate using the CA-Bundle from the Certificate Authority. I encountered an issue where the SSL Chain was broken and it was only Firefox that displayed the Untrusted Connection warning but it was only if Firefox had not previously cached the Intermediate Certificates from another website. If you can also point me to technical documentation from Microsoft and/or Google that confirms this that would help as well. Note that since mixed content blocking already happens in. Passive mixed content is displayed by default, but users can set a preference to block this type of content, as well. Consequently, your website may appear broken to users (if iframes or plugins dont load, etc.). I don't see technical documentation regarding this issue so your help is appreciated. If your website delivers HTTPS pages, all active mixed content delivered via HTTP on this pages will be blocked by default. It may have something to do with the caching of certificates or it may be as I have described below.

I am attempting to document why Firefox displays a warning while Chrome and Internet Explorer do not.

Can someone please confirm the following for me? Or make any corrections? I want the information that I document to be completely accurate. I am attempting to document an issue that I recently encountered.

Firefox says insecure connection