New Thread to cover changes / feedback / experiences.
"Old" MR3 Thread: https://community.sophos.com/xg-firewall/f/discussions/123403/xg-firewall-v18-mr-3-feedback-and-experiences
Release Notes: https://community.sophos.com/xg-firewall/b/blog/posts/xg-firewall-v18-mr4-is-now-available
For XG Appliances, running in Active-Passive, we can accelerate more performance with the new fastpath technology. You should see more performance throughput on XGs running in Active-Passive.
The HA Setup…
Removing my comment as it was incorrect.
I had an issue with reflexive nat. I had to move the nat rule down to the bottom and turn off all reflexive nat rules for my terminal server.