Performance layer 4 VIP for SMTP not balancing

Thanks for the reply. The none working VIP is 10.229.103.49 NATpool 10.229.104.49 The working the working one is 10.229.103.37 NATpool 10.229.104.37

So they both exist on the same device in the same partition etc

The working one goes to a different set of server on a different subnet but the none working goes to 15.91.67.251 and 68.251 These aren't the real addresses but are NAT address on the other side of the firewall.

self IPs are 10.229.103.2 external and 10.229.104.2 internal

The LTM is a Viprion with dozens of servers and pools but these nodes are on a different network to the rest. There is a route and I would have thought if the monitors work then so should the vip. If the monitors are on 104.2 and the SNAT is 104.49 then the route should apply. 15.91.67.0/24 GW 10.229.104.1 and 10.91.68.0/24 10.229.104.1. Its the same gateway every other route uses.

The INFO about performance layer 4 is interesting although I can see traffic to the working VIP.