Samsung Galaxy S3 requesting network security key when tethering My S3 (Jellybean) was suddenly no longer recognised by my PC when plugged in via USB.  I solved that by debugging using Developer Options as advised in another thread, which allowed the driver to be installed... again (thank you).  

But now if I try to use it as a hot-spot via USB tethering, I'm prompted to enter a network security key.  

Previously it just connected without the need for this and furthermore, I don't know where I would find such a key since I didn't set it up in the first place.  

Help anyone?
Go to setting &gt; more settings &gt; tethering now enable tethering. On same screen tap tethering again, not to turn off, so tap to the left of the tether on switch. A screen opens, go to bottom left corner and tap configure.  Scroll down you will see a password field, tap the show password then copy and paste the password to notepad or write it down. When your laptop asks for a security key enter password. I did this for the first time in ten minutes.