This usually means the implementation of SSL on your server is not correct. The error is usually caused by a server side problem which the server administrator will need to investigate.
This message is sometimes displayed when accessing an SSL page via a proxy (including our own payment page PayPal).
If you have lost your certificate, need to move servers or had a problem with the installation then it may be possible to re-issue your certificate at no extra charge providing the common name remains exactly the same.
During a SSL/TLS certificate order you may see the option to select SHA256 or SHA256-FULL-CHAIN for the hashing algorithm.
When generating a CSR for a wildcard TLS/SSL certificate you have to ensure the domain is in the correct format.
This error occurs when the website has not enabled SSL connections or has blocked port 443.
The only solution is to re-issue your SSL certificate. Your new certificate will be truncated to 39 months and any remaining months will be lost.
When access a site you may get the above error in Chrome. This is a client side error.
Information on SSL File Authentication. File Authentication is available as an option instead of email validation for various certificates.
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.