Changing the port number

Every host contains one or more TCP/IP applications. Therefore, each TCP/IP application must have a port number (local address) which is unique on that host. The combination of host name and port number uniquely identifies a target TCP/IP application. For example, a UIM server instance. This indicates that other TCP/IP applications in a host cannot use the same port number, whether it is another UIM server instance or any other TCP/IP application. 

If you want to run multiple UIM server instances on the same host, you must have more than one startup configuration member and assign a unique port number to it. If you choose the port number that is already used by another TCP/IP application, the first TCP/IP application that claims the port number gets it.

Related topic

Customizing the UIM server

To change the port number

  1. Open your startup configuration member for editing.

    The startup member name is typically the same as the started task procedure name for the UIM server.

  2. In the member, find the PORT variable.
    The following example shows that the variable is set to the default port number, 9999:

      <bmc_parm id="PORT" value="9999" />

    Important

    BMC has a registered port number of 3683 with the Internet Assigned Numbers Authority (IANA) for bmc-ea. The UIM server is home to the z/OS implementation of the BMC Enterprise Adapter (EA), and therefore defaults to this port number. However, you can choose any port number approved by your TCP/IP administrator that is not in use on the intended hosts.

  3. Change the value to a unique port number between 1 to 65535.

    If you have multiple UIM servers on the same LPAR, you must assign each UIM server a unique port number. 

    Warning

    Before entering a port number, check with your TCP/IP administrator to make sure that the port number is unique for the host on which this configuration member is used. A conflict in port assignment results in program errors.

 

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