Replying to my own email with more info. Jon wrote: [..]
On http://savannah.gnu.org/ click "Login". See attached error. Close browser and never return to the site. How many visitors does GNU loose because the HTTPS SSL cert is not authenticated as valid by a root cert in browsers?
It gets worse. Each visitor needs to manually allow the URL root (savannah.gnu.org), I like all users did not realise that.. so again I get the error again. So basically said user has now given up twice on your site, unfortunately!
Best regards, Jon
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