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The `ipTypes` argument can be used to specify a comma delimited list of preferred IP types for
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connecting to a Cloud SQL instance. The argument `ipTypes=PRIVATE` will force the
@@ -123,7 +125,10 @@ SocketFactory to connect with an instance's associated private IP. Default value
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### Firewall configuration
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The Cloud SQL proxy establishes connections to Cloud SQL instances using port 3307. Applications that are protected by a firewall may need to be configured to allow outgoing connections on TCP port 3307. A connection blocked by a firewall typically results in an error stating connection failure (e.g. `com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure`).
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The Cloud SQL proxy establishes connections to Cloud SQL instances using port 3307. Applications
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that are protected by a firewall may need to be configured to allow outgoing connections on TCP port
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3307. A connection blocked by a firewall typically results in an error stating connection failure
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(e.g. `com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure`).
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