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Once every few days when I visit some website that has SSL encryption, Firefox gives me "This connection is untrusted" error. When I tried to add exception, it wouldn't let me because the "Confirm Security Exception" box is greyed out.

I think this is a DNS error because after I flush the DNS and wait a few minute the problem seems to go away. But then comes back in a day or two. How can I stop this from happening again? Am I under attack? I am using OpenDNS as my DNS server and MAC OS 10 Lion as my operating system.

ssl-error ssl-exception

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This might be misconfiguration on Facebook/Akamai's side -- Facebook uses the Akamai CDN for static files, and many other users have seen the same error message... The question is, though, why does /flushdns fix it temporarily. When the errors appear, what IP addresses are reported by dig +short www.facebook.com? – grawity Sep 1 '11 at 23:19
FWIW, akamai is some kind of load-balancing or caching service, and I assume a lot of your Fb content comes through them. - en.wikipedia.org/wiki/Akamai_Technologies – goblinbox Sep 1 '11 at 23:21
@goblinbox: It's supposed to return a Facebook-provided certificate, though. – grawity Sep 1 '11 at 23:31
Yeah, that's why I +1'd your comment: it was so much more coherent than mine! – goblinbox Sep 1 '11 at 23:32
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