Why does adb return offline after the device string?

Question

I use \"adb devices\" to get following result. Only one device is connected to PC by USB, but we get 8 lines of result.

Could anyone suggest the reason?

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Answer 1

if non of the steps work from the above. my device still offline after connected through wifi. i did the following:

go to your device...

1. go to settings.

2. go to developer options.

3. Allow adb debugging in charge mode only.

4. repeat the steps as you always do . which is:

   a. connet your usb on chargemode only. b. open command write: - adb tcpip 4455 - adb connect 192.168.1.11:4455 b. disconnect usb.

now everythings work for me .

Answer 2

To complete the previous answers, another possible solution is to change the USB socket in which your cable is plugged in.

I had this problem (with the classical answer about using adb kill-server / start-server not working) and it solved it.

Actually, it took some time to find that because Windows was correctly recognizing the device in my first socket. But not ADB. As Windows was recognizing the device, I had no real need to test other USB physical sockets. I should have.

So you can try to plug the cable in all your USB physical sockets directly available on your computer. It did worked for me. Sometimes the USB sockets are not managed the same way by a computer.

Answer 3

1. make sure the device is set for usb debugging
2. Have the adb client running (e.g. via "adb usb" or adb start-server"
3. LEAVE the device connected via usb!!!
4. AND THEN reboot the device.

This always brings my Motorola MB525 "online" again, after adb complains it would be "offline". I'm using OSX btw.

Answer 4

I made adb working on Android 4.4.2 with GT-N8010 (Samsung tablet) after setting device in authorized mode once upgraded adb to SDK version.

~/local/opt/Android/Sdk/platform-tools/adb
Android Debug Bridge version 1.0.32

While It did not work using :

adb version   
Android Debug Bridge version 1.0.31

Shiped in Ubuntu LTS version :

apt-cache show android-tools-adb  | grep Version
Version: 4.2.2+git20130218-3ubuntu23

This link may help then

Can't connect Nexus 4 to adb: unauthorized

Answer 5

You may also try downloading newest version of adb http://developer.android.com/tools/help/adb.html

Answer 6

 adb kill-server
 adb start-server

that solved my problem