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I'm getting this when trying to sign into mine and my fiance bank accounts why Secure Connection Failed

The page you are trying to view cannot be shown because the authenticity of the received data could not be verified. What can you do about it?

The issue is most likely with the website, and there is nothing you can do to resolve it. You can notify the website’s administrator about the problem.

Error Code: PR_END_OF_FILE_ERROR

I have a bookmark which I use regularly but, with the new version of Firefox, I get the error message NS_ERROR_NET_EMPTY_RESPONSE. I can access the webpage OK on my iPhone. The website is :- http://rasp.stratus.org.uk/app/viewer.php