Error - an existing connection was forcibly closed by the remote host
When this error occurs frequently, you should check log information as described here.
From time to time, the Data Collector may register the following log message:
An existing connection was forcibly closed by the remote host
This error indicates that SQL Server or the server hosting it closed the connection unexpectedly. Typically, SQL Server was restarted, or an operation that required closing all existing connections was run, such as a backup or restore operation.
When these errors occur sporadically, they do not affect data collection or the validity of the data.
Note: If these errors are occurring frequently, verify that data collection
is actually completing. You can review the log information for the
most recent Data Collector that is run through the Portal. See "Portal
Logs" in the HCL Discover Administration
Manual.