Symptoms
How to enable debug output in Parallels Plesk Panel to troubleshoot APS packages?
Resolution
Log level can be increased in Plesk's panel.ini file:
Unix: /usr/local/psa/admin/conf/panel.ini
Windows: C:\Program Files (x86)\Parallels\Plesk\admin\conf\panel.ini
Set the maximum verbosity as follows:
[log]
filter.priority = 7
The resulting log file can be found:
Unix: /usr/local/psa/admin/logs/panel.log
Windows: C:\Program Files (x86)\Parallels\Plesk\admin\logs\panel.log
If APS operations should fail, resulting output from APS package script can be found in this log.