I was deploying a virtual appliance and was baffled as to why I was unable to load the configuration web page from both Chrome and Firefox, until I visited the vendors web page and downloaded a hotfix that removed the SHA-1 certificate. This was an appliance released in 2015. It's a shame that the software vendor is releasing insecure virtual appliances, but it's also a shame that Google and Mozilla can't get their act together enough to display an informative error message.
How about "The site you are attempting to visit uses weak cryptographic algorithms, so the connection has been blocked."
And, please give advanced users a way to click through anyway. If this is a virtual appliance I'm deploying in an isolated network and I'm trying to access the administrative page, I should be allowed to get there, without some nanny state browser manufacturer determining that my crypto isn't safe enough.
This already exists, and you can find it by reading through the source of Chromium.