Port 5559 is the default JMS Server Direct Address port, primarily used within IBM WebSphere Application Server environments for specific messaging functionalities.
According to IBM documentation, the JMS Server Direct Address port is the listener port used for direct TCP/IP connection for publish/subscribe support. This connection type is designed for specific scenarios and has certain limitations:
- Connection Type: Direct TCP/IP
- Purpose: Publish/Subscribe support
- Supported Subscriptions: Limited to non-transactional, nonpersistent, and nondurable subscriptions only.
This means that systems needing to subscribe to messages from a JMS server directly over TCP/IP, without requiring transactional integrity, persistence (messages surviving server restarts), or durability (subscriptions surviving client disconnections), can utilize this port.
Think of it as a specialized door into the messaging server, optimized for speed and simplicity for certain types of message delivery where reliability guarantees beyond basic delivery aren't needed for every message or every subscriber state.
Key Characteristics of Port 5559 (JMS Server Direct Address Port)
| Characteristic | Description |
|---|---|
| Default Number | 5559 |
| Function | Listener port for direct connections |
| Protocol | TCP/IP |
| Messaging Pattern | Publish/Subscribe |
| Subscription Types | Non-transactional, nonpersistent, and nondurable subscriptions |
| Context | Typically associated with IBM WebSphere Application Server and its JMS components. |
For more technical details regarding port settings in IBM WebSphere, you can refer to the Ports settings documentation on IBM's website.
Understanding this port is crucial when configuring messaging applications that interact with IBM JMS servers, especially for scenarios involving simple, high-throughput publish/subscribe messaging where the advanced features of transactional or durable messaging are not required.
