Android: taged unknown / adb devices unauthorized

While debugging  my Android phone in Eclipse  I ran into a little issue with adb.
In the column Targed was displayed : Unknow

So I wrote "adb devices" in console and found, my device is unauthorized

~ $ adb devices
List of devices attached 
00310d2453155029 unauthorized

The solution is:

1.) Disable USB Debugging mode
2.) Connect device with USB cable
3.) Enable USB Debugging mode
4.) Confirmation message will be displayed (Accepting RSA key from computer)