NAT Traversal Force not working

[mikee]

Hi all.

Because of another device in the connection path (that doing outgoing NAT AND being an IPSec server too for it's own tunnels) I need to force phase I to initiate connections using port 4500/udp because the NAT device is consuming all 500/udp packets and dropping them.

So I have set the phase I type in pfsense to IKEv1 and selected 'Force' under NAT Traversal but pfSense still tries to set up phase I using port 500/udp.

Is this an expected behavior? I assume it is not but do not actually know. pfversion is 2.4.2. Thanks.

Edit: Added pf version info.

Regards.