IPNS0809 UNIX shell initialization failed, CALL=760 RC=129 RSN=0594-003D
might appear 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. After changing that message IPNS0809 should not appear any more.