You need to provide some specific information, such as the error data or server job logs, when reporting REXEC problems.
Any REXEC problem reported to IBM should include the following information:
The system value QSFWERRLOG must be set to *LOG for software error logging to take place. If an error occurs while QSFWERRLOG is set to *NOLOG, change the value to *LOG, try to re-create the error, and submit the logged software error data. If logged software error data is submitted, there is no need to perform a trace of the REXEC server.