**** NOTE ****** Will not connect wirelessly while MAC filtering is on.
After many hours (2 separate days x 3 hours each) of attempting to connect my xx42a (marked xx36sa on the camera) wirelessly, I finally decided to call X10 help support. Yes, their hours of support are very inconvenient since they are only open till 6 PM EST. Spent 2 hours with tech support going through the setup process in many different ways. We finally figured out that my issue was that I use MAC Filtering (for added security). I disabled MAC filtering on one of my routers and the camera connected wirelessly without a problem. I let them know that I am not about to make my network less secure just to get their camera to work. So Tech support was going to see if their upper tier techs had some firmware mod that would allow it to connect to a MAC filtered network. Before we hung up I thought of an idea to disable MAC filtering, connect the camera wirelessly, then enable MAC filtering again. This worked for me since one of my routers do not require a reboot to enable or disable MAC filtering.
Lesson learned is these cameras will not connect wirelessly while MAC filtering is enabled, and they don’t disclose this in any of their documentation.