Re: How to disable "authentication required by Wireless network" Popup
The same problem started happening very intermittently on my Toshiba laptop when I upgraded to F16. My guess is the problem is somehow linked to power management and suspend but that's strictly a guess.
Anyway, I have always had to power off and reboot to clear out the problem. I don't think it's strictly a hardware issue, but maybe some acpi bios incompatibility or something.