BTW, this is not a problem exclusive to GAE. The certificate for
"code.google.com" also seems to have changed recently and I just got a
warning from TortoiseSVN that the new certificate cannot be validated
because the certificate chain is incomplete.

Best regards,

On Aug 26, 3:42 pm, Carlos Rodrigues <[email protected]> wrote:
> Since the problem only happens with browsers that rely on Windows'
> certificate infrastructure, the version of Windows matters.
>
> I've tested with IE 8 on Windows 7 and Windows Server 2008 and the
> problem occurs;
> I've also tested with IE 7 on Windows XP and Windows Server 2003 and
> the problem does not occur;
>
> I did not test with Windows Vista.
>
> It seems that older versions of Windows follow the certificate chain
> (by downloading it from somewhere), while the more recent versions
> only follow it if the webserver itself provides the intermediate CA's
> certificate (as I said, I've tested with other sites that use
> intermediate CAs and they show no errors - because the intermediate
> CA's certificate is being provided by Apache using the option I
> mentioned before).
>
> Best regards,
>
> On Aug 25, 10:19 pm, Robert Kluin <[email protected]> wrote:
>
> > I only get a certificate error if I go tohttps://test.xx.appspot.com.  I do 
> > not get errors going tohttps://xx.appspot.com.
>
> > I tested with IE and Chrome and Windows.
>
> > Robert
>
> > On Wed, Aug 25, 2010 at 05:27, Carlos Rodrigues <[email protected]> 
> > wrote:
> > > Hi again,
>
> > > Any ideas? This is a show-stopper as far as secure applications go...
>
> > > Best regards,
>
> > > On Aug 23, 12:39 pm, Carlos Rodrigues <[email protected]> wrote:
> > >> Hi all,
>
> > >> I'm developing a small application on GAE that requires HTTPs, however
> > >> I'm having some trouble with the "*.appspot.com" certificate.
>
> > >> O Chrome, Safari and IE on Windows I get a certificate validation
> > >> error. This error appears to be related to the certificate validation
> > >> path, because the topmost authority is "Google Internet Authority" and
> > >> show as "Not found".
>
> > >> On Firefox there is no error, and the certificate chain correctly
> > >> shows Equifax as the root CA and "Google Internet Authority" as an
> > >> intermediate CA.
>
> > >> On the Mac both Firefox and Safari work without showing any errors.
>
> > >> Is there a way around this? I can't expect users to trust the
> > >> application if they get a certificate error on Windows in every
> > >> browser except Firefox.
>
> > >> So a summary of tested browsers:
>
> > >>   * Internet Explorer 8 (Windows): error
> > >>   * Safari (Windows): error
> > >>   * Safari (OS X): OK
> > >>   * Chrome (Windows): error
> > >>   * Firefox (Windows): OK
> > >>   * Firefox (OS X): OK
>
> > >> It appears that browsers which use the integrated certificate
> > >> infrastructure on Windows are affected, and others are not.
>
> > >> I know that Windows supports intermediate CAs because I've tested it.
> > >> But it seems to require that the website itself provides the
> > >> intermediate CAs certificate (for example, on Apache this would be the
> > >> "SSLCertificateChainFile /path/to/intermediate-ca.crt" option).
>
> > >> Google App Engine does not appear to do this.
>
> > >> Best regards,
> > >>    Carlos Rodrigues
>
> > > --
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