XT8 Wan port shows "unplugged" (its not)

[Shafiro]

I have a dlink dsl-245gr configured as a bridge (modem only).
I connect it to the WAN port of my XT8, but XT8 shows WAN as unplugged.
It is detected by XT8 when connected to LAN 1-3 ports.
Same cable worked with previous modem, when connected to WAN.
Is there any setting that could cause the WAN port not to detect the cable?
Or maybe it is possible to set XT8 to use LAN 1/2/3 ports for WAN connection?

 

[Shafiro]

just in case someone runs into something similar, I enabled & disabled dual wan with ethernet lan, and the wan port now detects the cable. fw 42095