What role does port 5151 serve in Qlik Sense?

Port 5151 is designated for the Qlik Sense Scheduler Service, more specifically as a slave REST engine. This port is vital for the communication and functioning of the scheduler service, which orchestrates background tasks such as data reloads and other scheduled operations in a Qlik Sense environment.

Understanding the role of this port is important because it allows the Scheduler Service to handle incoming requests and manage the execution of tasks efficiently. The communication over this port ensures that the scheduler operates seamlessly within the broader architecture of Qlik Sense, allowing for effective resource management and task execution.

In context, the other options represent different functionalities within Qlik Sense's architecture: for instance, the Data API involves data interactions but does not specifically utilize port 5151. The WebSocket listener is essential for real-time data exchange and notifications but operates separately. The Proxy Server is crucial for handling client requests and ensuring secure and efficient communication, yet it runs on different designated ports. Therefore, port 5151's specific assignment to the Scheduler Service makes the first option the most accurate choice.