Cannot upload SSL certificate "You must verify ownership of this certificate's domain(s)in order to upload it." but domains are verified

[Walraaf van Wouden]

I am trying to upload an SSL certificate that contains 5 domains. 

All domains are verified as custom domains: www.domain.com, *.domain.com and domain.com 

However I still get the error. 

Unfortunately the message doesn't say which domains it still wants to be verified (but I am sure that all are verified)

The certificate was purchased at Geotrust 

I have to idea what to do now. Is there a way to see which domain(s) GAE wants me to still verify?

[Alex (Cloud Platform Support)]

Hi Walraaf,

Before proceeding any further, make sure to add and verify all of the listed domains on your SSL certificate as described in this “Adding custom domain to your application” guide. You may be able to retrieve the unverified domain(s) in step 3 using your console’s Custom Domain Page. In fact, all of the domains listed on your certificate are required to be added to your project prior enabling SSL on them. Note that it may take some time before your added resource records in step 6 are put into effect.

In case you’re unable to solve your issue after following the previously provided guide, I will need you to send me the list of the domains you want to add with your Project ID to my email.

[Alex (Cloud Platform Support)]

As discovered privately, a mismatch between the desired domains and the ones listed on the previously emitted SSL certificate was causing the error. In order to retrieve the certificate’s alternative domain names, the OpenSSL command [openssl x509 -text -noout -in CSR.pem] was used.