Thanks Nicholas,

I've continued doing more testing and I can see some differences between 
applications that:
(a) had a SSL certificate configured using the old appspot console
(b) never had a SSL certificate

In case (a) the changes I make seem to be totally ignored. For example 
https://luisma.zeetings.com/home (/home doesn't do a redirect) keeps using 
the old certificate, even thought the new one was configured a couple of 
days ago.
In case (b) the changes take effect after a few minutes. 

I might be wrong, but I have the impression that migrated SSL 
configurations aren't working properly. 

> would it be too risky to try removing the old certificate entirely to see 
if the new certificate is served?

Well, if the new certificate is never served, that will be my last resort, 
but I would prefer not to do that. I still have one month to find a less 
risky solution.

Thanks

On Friday, April 8, 2016 at 2:31:33 AM UTC+10, Nicholas (Google Cloud 
Support) wrote:
>
> I've seen this take sometimes as long as 48 hours. Is App Engine still 
> serving the old certificate at the moment? I'm currently not getting any 
> successful handshake when attempting to connect to 
> https://about.zeetings.com (https://luisma.zeetings.com is redirected) so 
> it seems as no certificate is served at all. If the new certificate is 
> valid and has worked with a different application, would it be too risky to 
> try removing the old certificate entirely to see if the new certificate is 
> served?
>
> On Wednesday, April 6, 2016 at 2:22:25 AM UTC-4, Luis Manuel Parrondo 
> Merino wrote:
>>
>> Hi there,
>>
>> I've uploaded a new SSL certificate via https://
>> console.cloud.google.com/appengine/settings/certificates?project=[project-id]
>>   because the old certificate is about to expire.
>> I've enabled the new certificate for my app by entering in 'Edit 
>> certificate' and then selecting 'Enable SSL for the following custom 
>> domains'.
>> I tested the app via Chrome, FF, Safari and openssl and I always get the 
>> old certificate. Even after 24 hours.
>>
>> As a separate test, I've enabled the new SSL certificate in a separate 
>> app that didn't have an SSL set up before, and I can see in Chrome that the 
>> new certificate is being served.
>>
>> ----
>>
>> This is the openssl command I use:
>> echo | openssl s_client -connect luisma.zeetings.com:443 2>/dev/null | 
>> openssl x509 -noout -dates
>>
>> And this is the custom domain I'm trying to setup: luisma.zeetings.com
>>
>> Thanks
>>
>>
>>

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