My mobile Samsung Galaxy Duos S2 was successfully connecting with Eclipse but suddenly Eclipse cannot detect my device. I have USB drivers and everything installed and my mobile is recognized by my computer, but Eclipse is not connecting to it. All other devices connect successfully via Eclipse. Is there a way of checking that a particular device has drivers for Eclipse, or any other way to connect the device with Eclipse?
Maybe you're missing Samsung's universal USB drivers for mobile devices.
You can download a version from here.
Or, download the latest Samsung USB drivers from Bittorrent.
Then install Samsung USB drivers onto your computer.
Note: In Windows, simply relying on the Windows USB drivers will not successfully connect your device via ADB to Eclipse for Android development.