I have configured WiFi authentication on FortiGate 100D through RADIUS on Windows server 2008 R2. When I'm trying to connect to the wifi from a PC (Win 10), it works only when I check "Use my Windows user account" checkbox. If I put domain\user and password manually it doesn't work, I get a message "can't connect to this network". Why it works only when I check "Use my Windows user account" and doesn't work when I write user\password manually? What is the difference between the two, and how can I fix it?