The syslog-ng 3.0 Administrator Guide

Alliance will write error messages to the system operator message queue QSYSOPR. Use the Display Message (DSPMSG) command to view these messages. For more detailed information about a communications error, you can enable application logging on the TCP client definition. When you restart the TCP client it will write verbose information to the log file ALLOGA. You can use the Inquiry menu to view and print these logs.