I upgraded to the latest Home Assistant version and now my LIFX bulbs are no longer being found. The bulbs are successfully connected to my network and are sitting on a separate VLAN which my HA instance is also running on.
Inspecting open connections to my HA box, I found the following connections being opened up:
Proto Recv-Q Send-Q Local Address Foreign Address State
udp 0 0 192.168.2.1:42186 192.168.2.111:56700 ESTABLISHED
udp 0 0 192.168.2.1:59177 192.168.2.112:56700 ESTABLISHED
I just had to add the following rule to my firewall on my IOT VLAN:
-A INPUT -i enp1s0.10 -p udp --sport 56700 -j ACCEPT
My LIFX bulbs are now working again on the latest version of HA!