Make sure you enter the password case sensitive. openspot2.local will only work if the OS2 is connected to your Wi-Fi network. You can redo the initialization setup if you switch the OS2 back to AP mode by pressing the button for 3 seconds. You can find more info in the Troubleshooting section of the user manual:
http://manuals.sharkrf.com/openspot2/en/troubleshooting.html