Just updating this thread. We have added support for up to 5
chained/intermediate certificates. Users of Comodo and other CAs which
require more than 2 chained/intermediate certificates can now append the CA
provided bundles/intermediate certificates to their uploaded certificate.

Cheers,

Cayden Meyer
Product Manager, Google App Engine

On 3 August 2012 18:27, Nacho Coloma <[email protected]> wrote:

> Hi Cayden,
>
> Thanks for your reply.
>
> You appear to have the incorrect CNAME for your domain. This is most
>> probably what is causing android browsers to fail to connect. The correct
>> CNAME can be found in your Google Apps control panel. The uploading and
>> configuring certificates section of the SSL for Custom Domains
>> documentation <https://developers.google.com/appengine/docs/ssl> may
>> prove helpful if you have any issues.
>>
>
> Yep, I saw the change of ghs name but since neither certificate was
> working we are just stopping this (with this working configuration) until
> our new certificate arrives.
>
> We just purchased a new one with DigiCert that includes EV validation and
> uses (supposedly, as far as we could check) a single intermediate authority.
>
>
>> On the topic of intermediate certificates you should be able to download
>> a single intermediate certificate from Comodo 
>> here<https://support.comodo.com/index.php?_m=downloads&_a=view&parentcategoryid=1&pcid=0&nav=0>.
>> Usually certificate authorities provide a bundle file which contains the
>> full chain, all the certificates in the bundle are often not required.
>>
>
> Ours is (was) a Comodo EssentialSSL. It comes with 5 CAs in the bundle,
> and AFAIK most browsers require the chain up to the root CA.
>
> Don't worry about this, the change of certificate should fix it up.
> Anyway, I would reconsider the limitation of two CAs in the PEM bundle, if
> that's an option. Anyway, it's just my fault for not fully understanding
> the limitations before choosing the certificate provider. Thank God for the
> 15-days refund policy.
>
> Thanks for your support.
>
>
>>
>> On 2 August 2012 04:03, Nacho Coloma <[email protected]> wrote:
>>
>>> Hi, I have just configured a certificate for our own custom domain (VIP)
>>> and it is working fine, but Android browsers are rejecting to connect.
>>>
>>> Investigating, it seems that I should include the full chain of
>>> intermediate CAs to the uploaded PEM file, but that's not possible since
>>> AppEngine only allows at most two certificates in the PEM file. Our Comodo
>>> certificate has a chain composed of five CAs. If I try to upload the full
>>> PEM file, AppEngine complains that the format is not supported.
>>>
>>> The working certificate can be seen at https://koliseo.com. You can
>>> test it with:
>>>
>>> openssl s_client -showcerts -connect www.koliseo.com:443
>>>
>>> Desktop browsers are OK with it, but Android (Froyo and Honeycomb) will
>>> just refuse to connect. Any ideas?
>>>
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