Why does adb return offline after the device strin

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?

WH96TNE00361    offline
WH96TNE00361    offline
WH96TNE00361    offline
WH96TNE00361    offline
WH96TNE00361    offline
WH96TNE00361    offline
WH96TNE00361    offline
WH96TNE00361    offline

Answer 1

After wasting hours on it, I have updated my version of adb and now adb devices shows my device online and I can run the app on it again.

Answer 2

Run SDk Manager and install Android SDK Tools and Android SDK Platform-tools updates. ADB must be updated to a new version for 4.2.x

Answer 3

I had the same issue and none of the other answers worked. It seems to occur frequently when you connect to the device using the wifi mode (running command 'adb tcpip 5555'). I found this solution, its sort of a workaround but it does work.

1. Disconnect the usb (or turn off devices wifi if your connected over wifi)
2. Close eclipse/other IDE
3. Check your running programs for adb.exe (Task manager in Windows). If its running, Terminate it.
4. Restart your android device
5. After your device restarts, connect it via USB and run 'adb devices'. This should start the adb daemon. And you should see your device online again.

This process is a little lengthy but its the only one that has worked everytime for me.

Answer 4

also make sure adb isn't running in your processes automatically. If it's there right click open file location, figure out what is starting it, kill it with fire. Run the updated adb from an updated android sdk platform tools. This was the issue with mine, hope it helps someone.

Answer 5

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

Answer 6

I post here my question just in case is helpful for somebody else. My problem was that my colleague was connected to the same device and I was not able to connect to the same device.

Note: I had this problem with Amazon Fire TV connecting over Wifi.

There are 2 solutions:

Easy to "drop" his connection (sorry buddy :)

Restart the device
adb kill-server
adb start-server
adb connect device-ip

A bit more difficult but two clients can use the same device (use different TCP ports)

Please look at this answer