The Backlog property specifies the maximum size of the
queue used to manage pending connections to the server. If the
property is set to value which exceeds the maximum size for the
underlying service provider, it will be silently adjusted to the
nearest legal value. There is no standard way to determine what the
maximum backlog value is.
This property must be set to the desired value before the
Listen method is called, if the Listen method is used
with default parameters. The default backlog value is 5 on all
Windows platforms. The Windows Server platforms support a maximum
backlog value of 200.
Note that this property does not specify the total number of
connections that the server application may accept. It only specifies
the size of the backlog queue which is used to manage pending client
connections. Once the client connection has been accepted, it is
removed from the queue.