Same problem here. It used to work and now it doesn't. I'm using HTC Sensation and XP on a laptop.
It doesn't matter which order I launch the app/open web.airdroid.com and try to connect, I still get "Failed to connect. Make sure your device is connected to a same WiFi network." I've tried uninstalling and reinstalling the app, but no joy.
The link a couple of posts above is for a beta test that you have to be invited to and download a .apk file sent to beta testers by email.
It still works if connect my laptop to the internet via my phone's wi-fi hotspot, but that's not what I want.
It doesn't matter which order I launch the app/open web.airdroid.com and try to connect, I still get "Failed to connect. Make sure your device is connected to a same WiFi network." I've tried uninstalling and reinstalling the app, but no joy.
The link a couple of posts above is for a beta test that you have to be invited to and download a .apk file sent to beta testers by email.
It still works if connect my laptop to the internet via my phone's wi-fi hotspot, but that's not what I want.