I have Google Cloud project consisting of a compute engine instance which I want to configure as a push subscriber of Cloud Pub/Sub service. I have setup an apache webserver with a self-signed certificate on the instance and have also made a DNS entry (abc.mydomain.com) which points to the instance which has a static IP address. I am already a verified owner of the domain (mydomain.com) on webmasters.
Whenever I add the subscription from the Cloud console, it fails with the error: "The subscription could not be added" and does not show any other useful information.
Please help.
Self-signed certificates are not supported. There are few options for you:
- Pay for the certificate
- Use App Engine as a proxy
- Use pull subscriptions
- Use App Engine Managed VM
The last one is basically a Compute Engine instance, but you will get free https connection via a subdomain of appspot.com.
来源：https://stackoverflow.com/questions/32800269/unable-to-configure-google-cloud-pub-sub-push-subscriber