Tried with 9.0.1. No Change. But playing further, it basically boils down to MAC Filtering turned on the Linksys router. So, there are 2 scenarios that I'm seeing here:
1) Keep the SSID visible and enable MAC Filtering. Wi-Fi on iPhone connects immediately
2) Keep the SSID Hidden but disable MAC Filtering. Wi-Fi on iPhone connects immediately
Any other combination, Wi-Fi will not connect, no matter what.Interestingly, if I turn on Guest Network on my Linksys, then connect to that first and then connect to my other SSID (non-Guest), even with the above settings in place, Wi-Fi will connect. But it is temporary as if I turn Wi-Fi off and back on, same issue.