I created a VM instance in Googl Compute Engine and app in Google App Engine standard environment. I was planning to have my app in App Engine and my database server in Compute Engine. But, I can't connect between the both by internal IP. Is this possible? the app and db are in the same zone (us-east1) but the connection by IP don't work, only work with external IP. Apparently, the rules of firewall are correct.
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