Twobob, thanks for your reply.
I downloaded the full version of putty and it appears that I can't even ssh into my DX (screenshot below).
http://i1208.photobucket.com/albums/...ps0b5adaa4.png
My putty settings seem to be set to erase old known host files.
http://i1208.photobucket.com/albums/...psf6847ebd.png
I moved recently, so my ISP and modem/router have changed. But I always use default settings to set up my wifi networks (including my current one), so I hope this isn't the problem. Regarding your DHCP question, all that I can confirm is that my network is "DHCP enabled" (screenshot below). Also, shown below a general snapshot of my wifi network, in case that's of interest.
http://i1208.photobucket.com/albums/...psed086552.png
http://i1208.photobucket.com/albums/...psf180e024.png