Please see step 3 in the documentation
<https://cloud.google.com/appengine/docs/python/console/using-custom-domains-and-ssl>
regarding verifying your domain, particularly:
1. Supply the domain name ("example.com") and click *Verify*. This opens
up a new tab titled *Webmaster Central*.
2. Follow the directions provided by the *Webmaster Central* tab, then
click *Verify*.
On Saturday, September 17, 2016 at 12:09:13 AM UTC-4, Huy Nguyen wrote:
>
> Dear GAE support,
>
> I want add new custom ssl domain for my project in GAE,
> I added domain, then i add ssl certificate but not success. Message alert
> as image attacked,
>
>
>> You must verify ownership of this certificate's domain(s)in order to
>> upload it
>
>
> Ssl certificates namecheap for *.my_domain.com.
> Although webmaster tool added website property for my_domain.com and
> custom.my_domain.com
>
> what happens ?
>
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