Ping through forwarding VS

I have a forwarding VS to a subnet. I have a SNAT pool setup to automap for this subnet and set the SNAT options to forward all packets. I can ping from the subnet to the outside, but I i ping from the outside to the subnet I don't get a response. I have the VS set to all ports and I can ping the subnet from the F5 directly. I can also RDP from the outside to a server on this subnet as well so I know my routes are correct in OSPF. What am I missing?

 

 

Russell