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If your Lambda and Redshift are in the same VPC, you should check:
- that the security group associated with your Redshift cluster allows inbound traffic from the Lambda function. You can do this by allowing inbound traffic on the port Redshift is using (default is
5439
) from the security group associated with your Lambda function. - the network access control lists (ACLs) for the subnets to ensure they are not blocking traffic between your Lambda function and the Redshift cluster. Network ACLs can be configured to allow or deny traffic based on IP address, port, and protocol.
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