The Event Summary chart of the Service Administration page fails with a message like:
An error occurred while collecting data for the chart
Check the web service data source. : Cannot execute
the statement. : :
Illegal character ...
The chart fails to display.
This chart uses data from the events in the objectserver.
Resolving the problem
Check the Node fields in the objectserver events for bad (unprintable) characters and correct the cause in the application that created the events.