Ensuring that you are using the correct JDBC driver version, verifying the connection URL, checking network connectivity, and validating the security group settings are all essential steps in resolving this issue. Conclusionīy following the troubleshooting steps outlined in this blog post, you should be able to resolve the “Connection is closed” error when connecting to a Redshift cluster using the JDBC41/4 driver. If there is no such rule, add one by clicking the “Edit Inbound Rules” button and specifying the appropriate IP address and port.
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