Message
IPNS0809 UNIX shell initialization failed, CALL=760 RC=129 RSN=0594-003D
appears in response to any NETSTAT command.
This is caused by the OMVS segment of the SSI started task user ID having not the correct definitions for Parameters HOME= and PROGRAM= in the security definition of the OMVS-Segment.
Most likely they are not written in lower case and therefore do not match the directory names in OMVS.