Advice on Configuring NAT Masquerading with ISP Failover

Hi all, I have two ISPs in my Sophos UTM 9: a primary and a secondary line. Currently, I’ve set up masquerading for the primary line using the external interface, which was straightforward. Now, I’d like...
HA config - After trying to upgrade to the latest version I can no longer reach the web admin page

Sophos UTP PC Config: The PCs (HP SFF 6200 pro i3 (2120) 3.3Ghz) that I have been using for Sophos UTM for years has a total of 6 Ethernet ports. eth0: (Dell/Intel U3867 single port PCIe) is the HA...