When trying to browse https://stackoverflow.com I receive an error that the certificate is not valid. The reason is that *.stackoverflow.com comes with a certificate for *.stackexchange.com at the moment.

More details:

SHA-1 fingerprint of the cert:


Issued by: DigiCert High Assurance CA-3

  • Same problem: tried to reach stackoverflow.com but the server name is *.stackexchange.com on Chrome 33.0.1750.154 m, Windows Seven Enterprise
    – Nk SP
    Commented Apr 8, 2014 at 14:00
  • 4
    Well, they are in the process of re-issuing certificates after fixing a critical bug, guess this will go away by itself when the process will be done. :) Commented Apr 8, 2014 at 14:02
  • 4
    QUICK EVERYBODY EXPLOIT TH— oh. Commented Apr 8, 2014 at 14:04

1 Answer 1


This is a race condition as we upgraded certs immediately but DNS took a bit to catch up. You should now be seeing a valid cert which we'll be updating again as soon as we receive a new combined wildcard for that particular certificate.

Most CAs are a bit busy today which is understandable.

  • 2
    Why are they particularly busy today? Commented Apr 8, 2014 at 15:37
  • 9
    @Duncan In case that wasn't sarcasm here is a link to the reason CAs are busy today. Commented Apr 8, 2014 at 15:42
  • 2
    @MatthewGreen It wasn't sarcasm, thanks for the link. Commented Apr 8, 2014 at 15:43
  • What about per-site-metas? I see the same warning when opening any of them directly using HTTPS.
    – asheeshr
    Commented Apr 8, 2014 at 16:56
  • @AsheeshR we do not support SSL on per-site metas and won't at their current URLs at all. Note: we don't link you to them over https:// either. Commented Apr 8, 2014 at 16:57
  • The "sign in" link does point to https:// Commented Apr 13, 2014 at 18:15
  • @ThiefMaster The "sign in" link doesn't point to the child meta. It would (appropriately) throw an invalid cert warning in almost every browser if it did. Commented Apr 14, 2014 at 3:35
  • I went to meta.arduino.stackexchange.com and clicked "sign up" (sorry, not "sign in"). I ended up in meta.arduino.stackexchange.com/users/… which does not have a valid certificate. Commented Apr 14, 2014 at 7:52
  • @ThiefMaster that's definitely a bug, it'll be fixed in the next build. Commented Apr 14, 2014 at 10:20

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