Follow these steps to delete all the collected syslog messages for a particular syslog source:

1. Select Delete (Main toolbar):
   

   
   

2. Choose the date range to include all the messages in the syslog storage:
   

   
   

3. Select Criteria to open the Filter Criteria window. Mark the syslog source:
   

   
   

4. Select OK to close Filter Criteria window. Click Delete, then confirm the operation.