Configuring the Telnet server

 

The topic contains information about how to configure your Telnet server for various emulation types.

One of the most important Telnet functions is its ability to negotiate options between the client and the server. This type of open negotiation makes it possible for either the client or the server to initiate or to honor a request. Several different emulation types are available to you for negotiating requests and converting them to output. The system can support 3270-type workstations and VTxxx workstations, but the preferred type is 5250 emulation.

To configure your Telnet server for use with one of the other emulation types supported, complete the following children linking tasks that contain task steps.

After you have configured Telnet, you might want to secure Telnet with Secure Sockets Layer (SSL).

  1. Starting the Telnet server
    The active Telnet server has one or more instances of each of these jobs running in the QSYSWRK subsystem: QTVTELNET and QTVDEVICE.
  2. Setting the number of virtual devices
    You can enable the Telnet server to automatically configure a set number of virtual devices and controllers using the QAUTOVRT devices system values. You can also limit the number of sign-on attempts allowed.
  3. Restricting privileged users to specific devices and limiting sign-on attempts
    The sign-on system values are used to both restrict or limit the devices to which a user can sign on and to define the number of system sign-on attempts allowed.
  4. Setting the session keep-alive parameter
    You can use the TCP keep-live parameter to set the maximum idle time that the TCP protocol allows before sending a probe to test for an inactive session.
  5. Assigning devices to subsystems
    Before a user can sign on to the system, the workstation must be defined to a subsystem. The workstation is the virtual display device that is selected or automatically created by the Telnet server.
  6. Activating the QSYSWRK subsystem
    The system job for a TCP/IP application must start in the QSYSWRK subsystem. The spooling subsystem, QSPL, needs to be active to run printer pass-through sessions.
  7. Creating user profiles
    On the Telnet server, you can create Telnet user profiles using iSeries™ Navigator.
  8. i5/OS supported emulation types
    The preferred emulation for the system is 5250 emulation. However, the system also supports 3270 and VTxxx emulation.
  9. Securing Telnet with SSL
    With the Secure Sockets Layer (SSL) protocol, you can establish secure connections between the Telnet server application and Telnet clients that provide authentication of one or both endpoints of the communication session. SSL also provides privacy and integrity of the data that client and server applications exchange.

 

Parent topic:

Telnet

Related concepts
Telnet scenario: Telnet server configuration