SHA is a popular hashing algorithm used by the majority of SSL certificates. As computing power has increased the feasibility of breaking the SHA1 hash has increased.
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 error message means that the server is returning a certificate for a different common name than that specified in the address bar.
The SSL123 certificate is issued by the Thawte Server CA. This is present in Windows Mobile 5 devices. It is NOT present in Windows Mobile 6.
Once you have completed your order you can access the relevant intermediate CA from the order management page. This will ensure you get the appropriate intermediate certificate.
A warning is displayed in the Chrome console window regarding your certificate
This error (normally presented by Firefox) means that the OCSP stapling for the site certificate is invalid.