Created attachment 124008 [details] Firefox warning and information The certificate for https://valgrind.org is for another site, so browesers (Firefox, Chrome) refuse to enter.
Where did you see that URL advertised?
It should be fixed now. Per, can you try again?
It works now. Thanks. (I did not see that URL advertised but I use https for everything, if at all possible.)
Well that is what I suspect and was kind of my point - it is not valid to assume that you can just replace http with https. When a site has not been https enabled and you try that you are going to get an error, whether a mismatch like this because you get a certificate for a different site on the same machine or a self signed certificate or just a connection failure. It's fixed now anyway, and valgrind.org is improved by being https enabled which is a good outcome.
It is indeed a good outcome. Plain http is obsolete and Google Chrome, for instance, shows such sites as "Not Secure", which is not a good first impression. So, perhaps the https version of the URL should be what is advertised henceforth?