@thewaterbug said in Restoring 2.3.4 Backup to 2.4.4: Interface Mismatch and hang . . . .:
now I can import the old Backup with no errors. Once I disable the Gateway, it will boot normally at full speed.
Victory! I restored my 2.3.4 config to the MBT-2220 as described, replaced the APU2 unit, and un-disabled the WAN gateway. Everything is working as expected, and my IPSec tunnels came up immediately. I had about 5 minutes of downtime.
Now I can do a clean install of 2.4.4 on the APU2, use that to replace the other APU2, reinstall on that one, and then use it to replace my obsolete m1n1wall/Alix unit.
Thanks for all the help!