Starting on Feb 19, an issue with Cloud SQL occurs with the App Engine's 
Cloud SQL Proxy. I get the following error in the App Engine logs:

error when connecting to db: { Error: connect ECONNREFUSED 127.0.0.1:3306

The app works on my local machine with Cloud SQL Proxy, as does the 
counterpart app in Compute Cluster. It used to work in App Engine, too. I 
double checked the App Engine user's credentials are set to Editor. The SQL 
instance is 2nd gen and in the same project as the App Engine app. The SQL 
API is enabled. I noticed that recently the App Engine parameter vm:true has 
been deprecated in favor of env: flex. I tried it both ways, with the same 
result. I also tried restarting the SQL server. It is in us-east1 and the 
instances are in us-east1-b/c.
I also posted in Google Cloud SQL 
<https://groups.google.com/forum/#!topic/google-cloud-sql-discuss/0GkfrHB94-I> 
with some other details.

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