Manual/basic GAE instance in Java11 gets 403 on start

[Eduardo Moraleja]

Hello,

Migrating from dynamic instances in Java11 GAE to manual/basic instances results in 403 error when Google services (from IP 0.1.0.3) performs a "/_ah/start" request.

App Engine is configured with Private Service Access and is only accessible from the VPC and specific IP's. No firewall rules apply because it's an internal request from Google but rules were configured for testing purposes. Either in manual or basic mode the result is the same, if we roll back to the dynamic mode it works fine.

Does anyone with a similar problem? Thank you in advance.

Eduardo Moraleja

[Amit Sinha]

Hello Eduardo, 

If I understand the issue correctly, when you are changing the app.yaml file to change the scaling type from dynamic, it starts to give the error. Is my understanding correct? Could you please confirm if you are using this serverless VPC access?

Internally, I didn't see anything reported related to this.Please note, Google Group is intended to provide general information about the Google Cloud Platform. If you believe this issue is related to the product, I would recommend that you open a private issue and provide more details with the error logs so that we can investigate this further. I hope it will be helpful.