I know this thread is a few months old, but I hope I can be of some help.
Check your Router's setting to see if MAC filtering is turned on, if it is, turn it off. I was having the same exact problem as you were with my TP2.
Here is a post I made over in the MightyRom thread explaining how the MAC filtering on my router got turned on by accident.
http://forum.ppcgeeks.com/showpost.p...postcount=8956