Error In Re-connecting To Adb Over Wifi

I am using android on ubuntu 13.04 and once when my usb cable was broken I searched SO for connecting android device over wifi and found this link helpful It worked like charm but

Solution 1:

Finally after uncountable tries I was able to make it work

I am answering for sake of sharing it with people who may need help in this

First I revoked usb authorization for all computer from mobile ( I doubt if anything as such was there before 4.3 android)

Then I killed adb server

adb kill-server

Then I connected my mobile with laptop and invoked

adb usb 

It gave me the following error

error: device unauthorized. Please check the confirmation dialog on your device.

and in next moment I got a dialog on mobile for authorizing usb debugging

I allowed it and voila , it worked