It means that all information that is sent or received via the site that uses Internet security protocol is encrypted. If the site uses the SSL certificate, its URL address starts with the HTTPS (Hypertext Transfer Protocol Secure), not the standard HTTP. Secure Socket Layers (SSL) is an Internet Security Protocol, which is used by most banks, social media, and e-Commerce sites to protect visitors’ personal and financial information from leaks. “Your Connection is Not Secure” is called the SSL error and may also be found as SEC_ERROR_UNKNOWN_ISSUER (such code is provided on the error message). In simple terms, this alert blocks computer users from accessing the website and might pop-up unexpectedly. However, Chrome users might encounter similar problems.
“Your Connection is Not Secure” particularly appears on Firefox. To repair damaged system, you have to purchase the licensed version of Reimage Reimage.