A cloud architect created a new delivery controller for a large VM farm to scale up according to organizational needs. The old and new delivery controllers now form a cluster. However, the new deliver

A firewall blocking the necessary communication port between the new delivery controller and the license server would prevent the controller from reaching the licensing service to validate or apply the license, causing an error when attempting to enter the license code. Network connectivity issues, often caused by firewalls, are a common reason for licensing failures in distributed IT environments.

If the existing license was for a lower version, the system would likely present a version mismatch error rather than a general error when entering the license code.

Enterprise licensing for delivery controllers typically supports clustered deployments, making it an unlikely general limitation.

If the license had expired, it would likely affect the entire cluster or present an explicit expiration error, rather than manifesting as an entry error specifically on the new controller.