Customize member MFAAMS in the CNTL data set. This is the started task JCL procedure for using Access Method Services, required for dataset renaming using MVS Explorer in the eclipse client. Use the ISPF change command to change HLQ to your qualifier (hlq).
If you are using IBM's TCP/IP, overtype TCPIP.OS390.TCPDATA with the name of your installation's "TCPIP.DATA" data set (tcpdata).