Not normally, no. Normally one just connects the 3rd party router to one of the LAN ports on the back of the HughesNet modem.
Have you used this fiber optic line before and know that it works? Might you be able to bring the router to where the HughesNet modem is and make sure that it connects and can set up via regular LAN cable?
Have you tried bridging mode?
Unfortunately, the HT2000W doesn't have a bridge mode.
I brought to router over and connected it via LAN line and it connected fine. I brought it back over and it would not connect.
I also tried the original setup where the modem went to the router WAN port and the fiber optic box connected to the router LAN. No luck there either.
I'm not sure if there is some type of setting that needs to be changed in order to make it work with the fiber vs standard LAN cable. Those more knowledgeable than I about the HT2000W, including the reps, may have some ideas.
Though you may have already tried this, is there a LAN connectible device that you can use to make absolutely sure that the fiber line is still in working order, as in one end connected to a LAN port in the HT2000W and the other end, in the other house, connected to a device. I mean other than the Netgear router, of course. Just a laptop, or even desktop, or something similar.