Connections to your Cloud SQL instance from your App Engine application could be timing out due to a number of reasons. It is recommended to ensure that your App Engine application is properly authenticated, and that you are not running into any of the connection limits.
-- You are allowed a maximum of 100 concurrent connections to your PostgreSQL instance, and 12 concurrent connections from each App Engine instance. If your instance has hit its limit, App Engine will timeout if it attempts to make a new connection. It is recommended to reuse your open connections with a connection pool, and share them between App Engine requests.
- Note that Google Groups is for general product discussions and is not for technical support. If you require further support connecting to your Cloud SQL instance it is recommended to ask your full detailed questions on Stack Overflow using the supported Cloud tags.
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