I don't know if this is the same problem that I often have, but I've found that every once in a while, my home network gets funky, and I need to re-boot my router and reset the WeMo (unplug, hold in the button on the WeMo as you plug it back in, wait for lights to change) then connecting my iphone to the WeMo wifi. I hate to do this as my network password is a PITA to enter into the iphone. I ended up making a note of it on my notepad that I could copy and paste.
It's a pain, but it has always seemed to work for me.
It's a pain, but it has always seemed to work for me.