macbook adb cannot open interface

Question

I am encountering a problem with Android ADB debugging through USB.

Using Macbook Air 2013 and trying to connect Nexus 6 dev phone.

On the MAC Android Studio

Answer 1

Same symptoms with a Galaxy S7 attached to Mac via USB. In my case, I had the Tizen IDE for Samsung Gear Development open. That also prevented adb working properly. Closing the Tizen IDE immediately helped.

In case you connect the mobile phone the first time, you may already have acknowledged the authorization for the computer on the phone. You have to delete the authorization on the phone and re-connect / re-auth it. Otherwise, the device will show in the device list, but is unauthorized. (I.e. you can't debug...)