Arduino 2.0 RC1
I use the OTA sketch to test with a ESP8266 Lolin Wemos D1 mini pro. The port is showing in the show all ports section.
When I try to flash, the sketch compile without problems, the password is asked (if I don't have set a password too). I have then take 'admin' and re flashed the ESP with the com port. The Serial monitor gives the correct OTA string. After that another try with OTA, every time a goth an error.
Firewall disable don't have consequence.
One thing is a progress. Arduino 1.8 don't show the OTA port numbers on my win10 PC.
I have try with USB connected and with only 5V connected. Both same result.