After downloading new firmware Software version PKG4.421EUA my Netflix is now working for me with Sony Bravia KDL-46W905A
It was not working immediately but retried and it worked.

I suggest the following after downloading new Firmware
1. Refresh Internet settings
2. Power off TV from socket (starting to sound like Sony support)
Turn back on and try the NetFlix again
If still no luck then try turning on Wifi Direct - my wife got it working after changing settings so I'm relaying as much info as possible.

Peter