I was trying to use adb over TCP/IP. I have followed these steps
adb tcpip 5555
adb connect 194.68.0.100:5555
I have used my device for 2 days and now I am unable to connect to my IP address like when I do
adb tcpip 5555
it doesn't respond anything. Anyone knows what could be the scenario.
This answer is late, but hopefully it helps others.
I have had the same experience of not being able to connect. Rebooting phone and PC does not help. I found the fix at: http://developer.android.com/tools/help/adb.html at the bottom of the page.
Basically you follow these steps:
adb usb
adb tcpip 5555
adb connect xxx.xxx.xxx.xxx
Where xxx.xxx.xxx.xxx is your phone's IP address.