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My understanding of the issue is that, you have a a Cloud SQL instance and a App Engine app living within the same project. The issue started when you removed public IP access to your Cloud SQL instance. This action hindered your app's ability to connect to the Cloud SQL instance. The only way you can now connect is by providing the App Engine IP to Cloud SQL instance via the connections tab within the SQL section of the console. For the purpose of clarity, would you be able to confirm your App Engine environment? My investigation into private IP's for Cloud SQL indicates that "you cannot use private IP to connect from standard environment" and that you would have to use the flexible environment. Further details of this can be found here <https://cloud.google.com/sql/docs/mysql/private-ip#application_environment_requirements> . Also, if you are using the flexible environment, I believe it would be worthwhile to checkout the following documentation here <https://cloud.google.com/sql/docs/mysql/configure-private-ip> that describes how to configure a Cloud SQL instance to use private IP. The documentation highlights requirements needed to be fulfilled on a Cloud SQL instance before using a private IP. You may see if your set-up reflects these requirements. I hope this helps! ould be useful, -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/be232cfc-b54b-4267-ab1e-13774fb64bb4%40googlegroups.com.
