Hosted database systems may by default limit client access based on IP addresses. Therefore, to access data using the Hybrid Data Pipeline service, you may need to modify security settings in your hosted environment to include the public IP address Hybrid Data Pipeline uses to access the database.
For example, if you wanted Hybrid Data Pipeline to access a database hosted on Amazon RDS, you would need to modify the default settings of your VPC security group to include the Hybrid Data Pipeline public IP address. In a Salesforce environment, you might similarly modify Trusted IP ranges for an organization.
Refer to vendor documentation regarding client access based on IP addresses for information on how to modify security settings.