CF11 - How to handle unresponsive clustered instances?

My client is running ColdFusion Server 11,0,02,291725 on Windows. They've configured five clustered instances with session replication, and requests are forwarded to the cluster via IIS and the CF connector.

Client requests are frequently hitting unresponsive instances or instances in an error state (clients seeing Server Error 500).

Is there a recommended way to configure the CF connector to detect unresponsive instances and stop sending client requests to them?