Port information

The following table lists the ports that the product uses to communicate with the IBM® i server:
Product function Required TCP/IP ports on IBM i
Remote System Explorer functions: including filtering, editing, compiling, and running
  • 8470: IBM i central server
  • 8475: IBM i remote command server
  • 8476: IBM i signon server
  • 446: IBM i DRDA (record access) server
  • 449: IBM i server mapper server
Integrated File System (IFS) access 8473: IBM i file server
Interactive job support (via the STRRSESVR command) 8472: IBM i data queue server
Local port for interactive job support (via the STRRSESVR command) 4300: Remote System Explorer communications daemon.

This is a local workstation port that the STRRSESVR command uses to monitor "call backs" from the IBM i server to your local workstation.
Local port for integrated i Debugger 3825: Debugger server

This is the local port the debugger uses to communicate with the IBM i.
You need ports 8470, 8475, 8476, 446, and 449 to remain open for proper functioning of the product. However, you only need to keep the IFS and Interactive job support ports open if you require those functions.
To change the local Remote System Explorer port that your workstation uses to connect to the IBM i server:
  1. From the workbench menu bar, click Window > Preferences.
  2. Expand Remote Systems and click Communications to select it.
  3. You can change the port number in the RSE Communications daemon port number field.

To change the port that the debugger server listens on, use the IBM i WRKSRVTBLE command and add or change the entry QDBGSVR2. If this entry is not found in the table, the debugger server listens on the default port 3825

Note: For additional information about ports used by Rational Developer for i and the IBM i, including SSL information, see the following: