SPX identifies a listener protocol address by a network-wide unique service name. A SPX service name identifies a network service. Make sure that you are entering a service name that matches the SPX protocol definition of a listening location.
Select the service name to use.
Use the standard SPX service name of <computer_name>_lsnr:
Select this option to have the listener receive client requests on the default service name of <computer name>_lsnr.
Use another SPX service name:
Select this option to specify another service name to use other than <computer name>_lsnr. Ensure the listener was configured for this service name as well.