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If adb devices lists your Android device as offline, ADB cannot currently communicate with it—or the device is not responding. That status does not identify one specific fault. Check the target and debugging authorization first, restart ADB, then follow only the branch that matches your connection: USB, wireless, or emulator.
1. Confirm which device is offline
Run:
adb devices -lGoogle defines offline as a device that is not connected to ADB or is not responding. A status of device means ADB is connected, but does not guarantee Android has fully booted; no device means ADB sees no connected device. See Android Debug Bridge documentation.
If several devices or emulators are listed, identify the target by its serial or model before troubleshooting. To direct a command to a specific entry, use adb -s SERIAL followed by the command. An emulator entry may be separate from the phone you are trying to fix.
2. Check debugging and authorization on the device
- Unlock the device. Look for an RSA debugging authorization dialog and accept it only if you trust the computer. For Android 4.2.2/API 17 and later, ADB may require you to unlock the device and acknowledge this prompt before commands can run. The prompt is a security check, not an error to approve indiscriminately. Android Developers explains the authorization requirement.
- Enable the debugging mode for your connection. In Developer options, turn on USB debugging for USB or Wireless debugging for modern wireless connections. The menu varies by Android release and device maker. Google lists
Settings > System > Advanced > Developer Options > USB debuggingfor its Android 9/API 28-and-later guidance; for Android 16 and later, it listsSettings > System > Developer options > Wireless debugging. Consult Android’s Developer options documentation if the labels on your device differ. - Refresh stale authorization or pairing if needed. Android Studio’s hardware-device guide documents forgetting a paired workstation in Wireless debugging or revoking ADB debugging authorizations. Revoking authorizations unpairs previously trusted workstations, so you will need to pair or authorize this computer again. Use Android Studio’s hardware-device setup guide.
3. Restart the ADB host server
If the status persists or ADB appears unresponsive, stop the host server and run another ADB command to start it again:
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adb kill-server
adb devices -lAlternatively, start it explicitly with adb start-server, then check the device list again. Google documents that a subsequent ADB command starts the server after adb kill-server. This resets the host-side ADB process; it does not itself repair a disabled debugging setting, missing authorization, cable problem, or network issue. ADB command reference.
4. If you are connected over USB
Test the cable and port
Try a known-good data cable and, if available, connect directly to a computer USB port rather than through a hub. Android Studio’s troubleshooting guide recommends testing a secondary cable and checking whether its Connection Assistant detects the device. This is a diagnostic check; an offline status alone does not prove the cable is at fault. Android Studio hardware-device troubleshooting.
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Check host-specific setup
- Windows: The device may require an applicable ADB USB driver. The correct driver depends on the device manufacturer; use its supported driver or setup instructions.
- Ubuntu: Check that your account has the required
plugdevgroup membership and that appropriateudevrules are installed. - macOS and ChromeOS: Google’s cited hardware-device setup guide says no additional configuration is needed for these operating systems.
In Android Studio, open the Connection Assistant to rescan USB devices, review USB debugging setup, and restart the ADB server. If the device still will not connect to Android Studio using ADB after the relevant setup checks, Google recommends contacting the device manufacturer. Android Studio hardware-device setup.
5. If you are connected over Wi-Fi
Wireless troubleshooting depends on Android version and connection mode. Do not mix the modern pairing flow with the older TCP/IP procedure.
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Modern Wireless debugging (Android phones, Android 11/API 30 and later)
Use Android’s Wireless debugging pairing flow and keep the workstation and device on the same Wi-Fi network. Google’s setup also calls for current SDK Platform Tools. Pairing and network discovery are part of this method, so a USB cable or driver fix may not address a wireless failure. TV and Wear OS devices have different minimum-version guidance; check the version requirements in the ADB documentation and Android Studio setup guide rather than applying phone instructions to them.
If pairing or discovery fails, check whether the network supports mDNS and allows the relevant traffic. To inspect discovered services, run:
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adb mdns track-services --proto-textGoogle’s ADB guide also documents enabling ADB_TRACE=all, restarting the server, reproducing the problem, and using adb server-status to locate the host log for a wireless issue report. These diagnostics help distinguish discovery or host issues from a device-side problem. ADB wireless debugging and troubleshooting.
Legacy TCP/IP workflow (Android 10/API 29 and earlier)
This older workflow begins with a USB connection and requires the device and computer to remain on a suitable shared network:
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- Connect the device to the computer over USB and confirm that USB debugging is enabled and authorized.
- Run
adb tcpip 5555. - Disconnect USB, then connect to the device’s IP address with
adb connect IP:5555. - If the connection drops, retry
adb connect IP:5555. If that does not help, runadb kill-serverand begin the procedure again.
Some Wi-Fi access points or firewalls do not support ADB traffic, so being on Wi-Fi alone does not guarantee this connection will work. The documented legacy commands and caveats are in Google’s ADB guide.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.6. If the offline entry is an emulator
Do not troubleshoot an emulator as if it were a phone: cable checks and a phone’s RSA prompt do not apply. Google documents a specific emulator visibility edge case: the ADB server is stopped, an emulator starts on an available odd-numbered port from 5554 through 5584, and ADB starts afterward. For that case, start ADB before launching the emulator or let the emulator choose its ports. This is a narrow listing issue, not a general explanation for every emulator marked offline. ADB emulator connection guidance.
7. Choose the relevant connection path
| Check | USB | Modern wireless | Legacy TCP/IP |
|---|---|---|---|
| Android eligibility | Device and host setup vary; the cited guide does not give one universal minimum version. | Android phones: Android 11/API 30 and later; TV and Wear OS have different requirements. | Android 10/API 29 and earlier, according to Google’s documented legacy procedure. |
| Initial physical connection | USB is the connection. | Pair over Wi-Fi; the documented phone flow does not require an initial USB connection. | USB is required to start the documented TCP/IP flow. |
| Main checks | Data cable, port, debugging authorization, and applicable host driver or permissions. | Wireless debugging enabled, pairing, same Wi-Fi network, and network discovery. | USB setup first, then shared network and ADB traffic support. |
| Typical diagnostic focus | Use a secondary cable and Android Studio Connection Assistant to isolate USB and host setup. | Check pairing and mDNS; host logs can help investigate wireless problems. | Retry the connection or reset the host server if the connection drops. |
These are different connection paths, not interchangeable fixes. USB is useful for isolating cable and host configuration; wireless avoids USB-driver dependencies but adds pairing, network, firewall, or discovery requirements. The details and version qualifications come from ADB documentation and Android Studio hardware-device setup.
8. What to collect if it remains offline
For an unresolved wireless issue, capture the ADB host log using Google’s documented ADB_TRACE=all and adb server-status procedure, along with the output of adb devices -l. When asking for help, include the device model, Android version, host operating system, whether the target is a phone or emulator, and whether the connection is USB, modern Wireless debugging, or legacy TCP/IP. For persistent USB or device setup problems, Android Studio’s guidance is to contact the device manufacturer.
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