after a clean installation of netbeans , i was able to debug for about 2 days , 
but without changing anything in my computer , 
now i can't debug anymore. 
after hitting Ctlr+F5 , my browser launches , the first line of my code is Green (ready to start) 
but if i hit any debug key F5 , F8 , F7 , etc... i h'ave got a message box saying :
'socket execption occured'.