iRule Event LB_FAILED - Triggered for Active Server-Side Connections?

Avery,

The LB_FAILED event does not trigger mid-connection, only when selecting the server. There is the CLIENT_CLOSED event and the SERVER_CLOSED event which will activate when there was a connection close between the client and the F5 or the server and the F5 respectively, but nothing that would activate only on a TCP error. It seems like F5 has not yet added a way in to determine whether a TCP connection was closed normally through a four-way close or if it was from a RST/time-out. As you can see in this article, it has been an issue for some time.