When an issue occurs, we recommend that you view the SUM UI as your very first step.

In many cases the SUM UI displays an excerpt of a log file that is a good starting point for analyzing the errors.

For more log files, navigate to <DIR_PUT>/abap/log, either using transaction AL11 in your ABAP system or using your preferred tool on OS level (for example WinSCP or Putty) and sort the files in a descending order by time (for example on UNIX using the command ls -ltr).

In general, check first the most recent files, since the SUM updates the log files frequently. In some cases, it also makes sense to check the most recent log files in <DIR_PUT>/abap/tmp.