Various symptoms may be occurring when USS security for /tmp is not defined correctly.
Netmaster is having USS problems, but issuing SELFTEST shows all is well.
Attempt at issuing $$SYSPRO NMIPDIAG hangs
onetstat or other USS commands hang.
No reliable diagnostic commands are available.
See also KB000108143 for more symptoms
Netmaster Network Management for TCP/IP12.2
Netmaster File Transfer Management 12.2
Apply PTFs SO04852 and SO04853 to prevent the hang situation.
This also changes the SELFTEST command to issue $$SYSPRO NMIPDIAG under the covers as well as some additional cleanup.