Port Forwarding?

Hi.

Another bemused newbie I’m afraid.

MCH 4Tb successfully up and running and has backed up 300Gb via third party software. Seems to intermittently drop the Z: drive mapping which is causing the scheduled back up to fall over.

Device conected directly to ISP router, desktop PC plugged into WiFi extender / router which is then plugged into the ISP router.

Connection mode in app seems to flip flop but mostly red (proxy relay mode?). Do I need to configure port forwarding, and if so how pls.

TIA

from a different post that may help