You use options on the Administration page in Presentation Services to affect logging levels.
In the global header, click Administration.
In the Maintenance and Troubleshooting area, select the logging level to use under Reload Log Configuration.
Click Reload Log Configuration to allow the change to take effect without restarting Presentation Services.
The change remains in effect even when Presentation Services is restarted.
Click the Manage Sessions link to display the Manage Sessions page.
For each session, specify the appropriate level in the Log Level column of the table.
The updated level takes effect immediately for that session. When you select a level, ensure that its severity value is smaller than or equal to the value specified for all messages in Presentation Services.