The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
   Please contact the website owners to inform them of this problem. Alternatively, use the command found in the help menu to report this broken site.

Detailed error message is below shown : ----------------------------------------------------------------------------------------------------------- Secure Connection Failed mail.google.com uses an invalid security certificate. The certificate does not come from a trusted source. (Error code: sec_error_inadequate_key_usage) The page you are trying to view cannot be shown because the authenticity of the received data could not be verified. Please contact the website owners to inform them of this problem. Alternatively, use the command found in the help menu to report this broken site. Try again ------------------------------------------------------------------------------------------------------------ I am using Windows 7 ultimate and I have Kaspersky Anti virus 2013 for internet security. I am using Firefox version 30.0. I have tried opening google services with different profiles(guest, administrator,standard user) but each time the same error messages are displayed and google services can not open. Is this problem is created because of missing authorities certificates? I am using firefox on another computer but it has more authorities certificates than this computer with error message. In other computer google(search, mail, maps etc.) services are working correctly.