iRULE: forwarding virtual for sql ports

Virtual server protocol is configured as All protocols. So this iRule is giving the appropriate error.

In virtual server' Protocol setting change All to tcp and then apply the same iRule. Make sure your F5 software version is >=11.6 as TCP::idletime is introduced in 11.6

If you need to create UDP forwarding vs also, you can create the same virtual server with protocol as udp.

After modifying the protocol VS configuration will look like this

ltm virtual forwarding_virtual {
destination 0.0.0.0:any
ip-forward
ip-protocol tcp
mask any
profiles {
    forwarding_fastL4 { }
}
source 0.0.0.0/0
translate-address disabled
translate-port disabled