z/OS Communications Server
Diagnosing FTP Server Problems with Client Connect and Server Forking


Go to the FTP Traces page for information on collecting a server trace. A trace with options FLO, INT, ACC, and SOC will be needed. The trace can be activated dynamically using the MODIFY command.

A packet (SYSTCPDA) trace should also be obtained. Instructions for gathering a packet trace can be found in informational APAR II12014. Additionally, if you suspect this may be a problem with forking the server process, collect a SYSOMVS trace, along with a dump of OMVS and the OMVS dataspace. Details on submitting these traces for analysis can be found in informational APAR II12030.