I switched ISP's. I have a block of statics so I reconfigured the Sophos UTM by simply editing the IP address of the external interface and the IP's listed on the Additional Addresses tab. Those are the only settings that I changed. Everything works…

We have have a primary and secondary ISP connection at the office and configured uplink monitoring to automatically switch between them. In general the primary ISP line has been working well for several months (since Jan 2021) but during the last days…