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This test displays the number of connection types ( such as optimized, pass through, active, half-opened, half-closed, established, etc.) that pass through this device and alert administrators to promptly capture abnormalities in the device.

Outputs of the test : One set of results for the Riverbed Steelhead device is being monitored.

Measurement	Description	Measurement Unit	Interpretation
Optimized_conn	Indicates the number of optmized connections.	Number	Optimized connections are connections that process request quickly by first searching in local cache i.e. datastore. If the request is available in datastore, data are fetched from datastore. The request goes to the WAN, only on unavailability of that request in datastore. An optimized connection includes Half-closed, Half-opened, Active, Idle and Established connections in it.
Passthrough_conn	Indicates the number of unoptimized connections that pass through.	Number	Passthrough connections are connections that process request directly to WAN instead of searching in datastore i.e. local cache. Since the search request happens in WAN, which is time consuming, the passthrough connection will be an unoptimized one.
Half_opened_conn	Indicates the number of half opened active connections.	Number	Half-opened connection is nothing but a TCP connection in which the connection has not been fully established. If you are experiencing a large number of half-opened connections, consider a more appropriately sized Steelhead.
Half_closed_conn	Indicates the number of half closed active connections.	Number	Half-closed connections are connections that the Steelhead has intercepted and optimized but are in the process of being disconnected. If you are experiencing a large number of half-closed connections, consider a more appropriately sized Steelhead.
Established_conn	Indicates the number of established connections.	Number	Established connection is nothing but a newly forming, initiating connections available in the Riverbed Steelhead device. The connection is being established but doesn't yet have an inner channel.
Active_conn	Indicates the number of active connections.	Number	An abnormally high value for this measure could indicate a probable virus or spam attack to this device.
Total_conn	Indicates the total number of connections that pass through this device.	Number	This measure is a sum total of all optimized connections.