Secure Connection Failed Invalid Security Certificate

'Secure Connection Failed'
443 uses an invalid security certificate.
The certificate is not trusted because the issuer certificate is unknown.
(Error code : sec_error_unknown_issuer)

This could be a problems with the server's configuration or it could be someone trying to impersonate the server.If you have connected to this server successfully in the past the error may be temporary and you can try again later.

I obtained the above error when i try to download the image file from rapidshare.com website.Below is the proof for this error.

  

"Unable to verify the identity of site as a trusted site"
The above error may occur because of following possible reasons,

• your browser does not recognize the certificate authority that issued the site's certificate.
• The site's certificate is incomplete due to a server misconfiguration.
• you are connected to a site which is pretending to be original one in order to gain your confidential information.

Action :
Before accepting the certificate,the user should examine the site's certificate carefully.It is recommended to notify the site's webmaster about the problem.

SECURE CONNECTION FAILED : mail.google.com:443 uses an invalid security certificate.The certificate is not trusted because the issuer certificate has expired.The certificate will not be valid until <date &time>.
(Error code:sec_error_expired_issuer_certificate).
This could be a problem with the server's configuration or it could be someone trying to impersonate the server.If you have connected to this server successfully in the past the error may be temporary and you may try again later.