Issue with NAT Loopback on Flint 2 (GL-MT6000) – Unable to Access Internal Server via Public IP from LAN

[9b9e69c2-4b75-4420]

It sounds like a good time to make a backup:

MT6000 firmware question

Follow-up: I'm over-complicating things as I don't really use GUIs like LuCI. You can see what LuCI is going to back up @ LuCI -> System -> Backup / Flash Firmware -> Configuration. That tab shows the contents of /etc/sysupgrade.conf.