Symptoms
For a VIP with UDP protocol and fastL4 profile, the SERVER_CONNECTED iRule event is triggered in 10.x, but not in 11.x/12.x.
Impact
Unable to run iRule commands in a server-side context when data goes from client to server. The SERVER_DATA event does not fire until data is returned from server (or not at all if the server does not return data). The LB_SELECTED is client-side.
Conditions
This occurs when using the fastL4 profile and UDP.
Workaround
Change VIP from fastL4 to standard.
