Develop Reference

Cant run adb process

I'm creating an application in android studio but I am um able test it on the virtual emulator because the adb process won't start. It's giving this error.
I tried manually starting adb and all other things but this happens.
I tried reinstalling android studio and platform tools. I downloaded a separate adb and ran "adb start-server"/"kill server".
It just doesn't seem to work. So i constantly have to build the entire thing and generate apk to run it. Please help me guys!!!
Also regarding the virtual emulator i have intel haxm installed if that information was necessary.

It's may be because your emulator adb not allow the android studio to run on it and android studio try to stop and re-run but this process fail.
Me also the same problem. So i always follows this step and it's work for me.
1. Open android studio.
2. Try to run your app without opening your emulator(It will start your adb).
3. Then open your emulator and run your app.
It's working for me. May solve your problem.

adb server didnt ack. This issue will resolve ussually when you kill all instances of adb.exe and restart server again.
Open Task manager and kill all adb instances and start server again.
Try the following:
Close Studio.
End adb.exe process in taskmanager.
Issue kill and
Run adb kill-server
Run adb devices
Then start the emulator and try adb devices again. This should list your emulator-device.
Run you apk in studio.

If your are using Genymotion,try to link your Android Studio 's SDK to Genymotion Android SDK Path.Then try to type with adb devices, I hope this will help for you.

Android Studio error: cannot connect to daemon

I've been using AS for months, but since two days I get an error when I try to run my app:
Unable to run 'adb': null
'C:\Users\lapof\AppData\Local\Android\Sdk\platform-tools\adb.exe start-server' failed -- run manually if necessary
* daemon not running; starting now at tcp:5037
could not read ok from ADB Server
* failed to start daemon
error: cannot connect to daemon
I've read about a lot of people having this problem, but the solutions provided don't work for me. I read these questions in particular:
Daemon not running. Starting it now on port 5037
Android ADB - Daemon still not running
How to resolve the "ADB server didn't ACK" error?
Eclipse error "ADB server didn't ACK, failed to start daemon"
Adb won't start
How to resolve the "ADB server didn't ACK" error?
Daemon not running. starting it now on port 5037 * Cannot open 'nul': The system cannot find the file specified
A lot of answers to these questions say to close adb.exe from task manager, the problem is that adb.exe is not running and if I try to restart it by typing .\adb start-server on a PowerShell window I get the same error.
I also try to restart my PC but it didn't work.
On the Android device I'm trying to connect to (Samsung Galaxy S8) I enabled USB debugging. I even tried to eliminate all the authorized devices, but nothing worked.
I checked if the 5037 port was used by other processes, but it is used by adb.exe (and the firewall state on that port is allowed and not limited). By the way, as I said, in the task manager adb.exe is not present.
Last I tried to follow the instructions provided in the last question I linked (basically I re-downloaded adb.exe).
Initially I ran .\adb start-server and this strange error occurs:
* daemon not running. starting it now on port 5037 *
* daemon started successfully *
** daemon still not running
error: cannot connect to daemon
and then when I try to run my app on Android Studio it occurs this new error when it tries to start adb:
Unable to run 'adb': null
'C:\Users\lapof\AppData\Local\Android\Sdk\platform-tools\adb.exe start-server' failed -- run manually if necessary
ADB server didn't ACK
* failed to start daemon *
and then if I try to .\adb kill-server and then .\adb start-server or .\adb devices or .\adb usb the same error occurs again.
Moreover when I connect my device now it asks me to authorize my PC to connect.
I don't know if this can help, but lately I deactivated a lot of Windows services (but I don't think I deactivated something related to Android Studio).
Details
PC: Compaq
PC OS: Windows 10 Home
Device: Samsung Galaxy S8 (Exynos)
Device OS: Android 8.0
AS version: 3.0.1

The solution which worked for me -
Open Command Prompt as administrator and type
adb start-server
That's it

I had same problem a moment ago. I solved it:
Run CMD as Administrator
Enter adb devices to CMD.
The output for me is :
C:\WINDOWS\system32>adb devices
List of devices attached
* daemon not running; starting now at tcp:5037
* daemon started successfully
P9BCS87ABS9SCD5 device

Usually that's caused by the WinNAT service, restarting which solves the issue.
Just open the Command Prompt or PowerShell as Administrator, and type the following commands there:
net stop winnat
net start winnat
And wait a bit for the Android Studio to reconnect to the ADB.
P.S. If it doesn't reconnect, just type the following commands to restart the ADB:
adb kill-server
adb start-server

I solved the problem on my own.
Out of frustration I opened Control Panel > System and security > Windows defender firewall > Allowed applications and I added adb.exe (both private and public networks).
I came back to Android Studio, ran the app and magically it managed to initialize ADB and my phone connected via USB was there.
I don't really know why this worked, since when I checked in Start > All Programs > Accessories > System Tools > Resource Monitor > Network > Listening Port it said that on port 5037 the firewall was allowed.
Moreover I don't know why up to a week ago all worked fine and now I had to do this process to make it work.
If someone more experienced manages to explain this behaviour better I'll update this answer (or accepts his as best answer)

Run CMD or PowerShell as administrator
Then run the following commands:
net stop winnat
In correct folder run:
adb start-server
net stop winnat

Below solution solved my problem:
Go to your task manager
see if adb is running
right click & end the task
Go to command prompt
run adb devices
it will work fine

For my situation
The latest platform is version 30.0.3. I also have the same problem as this:
* daemon not running. starting it now on port 5037 *
* daemon started successfully *
My solving:
Step 1: downloading platform-tool version 28.0.1: https://developer.android.com/studio/releases/platform-tools#2801_september_2018
Step 2: remove platform-tool: go to SDK Manager -> SDK tools
Uncheck "Android SDK Platform - Tool"
Click Apply
Step 3: Going to folder android -> SDK and pass new platform-tool
Step 4: ADB devices.
Then It's working for me.

SDK Manager -> SDK tools
Uncheck "Android SDK Platform - Tool"
Click Apply

After using Android Studio and Emulator without any problems, suddenly it stop to connect to the Emulator, even adb server was running (killing and starting), firewalls raised for all the programs (adb.exe, qemu-system-x86_64.exe, studio64.exe, etc), port 5037 freed, uninstalled and installed again the programs, even the whole Android Studio from scratch. I got verything running OK, but no connection between AS and Emulator.
The solution to my problem was to run Android Studio AS ADMINISTRATOR, it seems that when I updated the program to 3.5.2 somehow the status changed, causing me the problem.

What worked for me in all adb unresolved cases:
adb kill-server
or
adb disconnect
I would just try them both and one will do the trick.

I had this issue several times. It seems if when system is starting, device is connected by USB cable, daemon will connect correctly and no problem will occur. Of course I want a better solution, because it is very hard for me to shut down and start again every time.

Had same issue after upgrading to Android Studio Bumblebee | 2021.1.1
To solve it, go to Settings -> Build, Excecution, Deployment -> Debugger
Then uncheck the option Enable adb mDNS for wierless debugger

I had the same error.
Error on android studio
i use easytether, which was causing the error when is connected.
http://www.mobile-stream.com/easytether/android_faq.html#adbmacosx
After u disconnect it, everything should work fine.

ADB server not running

When I run ADB and type in "adb start-server" it says
*daemon not running. starting it now on port 5037 *
could not read ok from ADB Server, error = 109
*failed to start daemon *
error: cannot connect to daemon
what should I do? I've tried killing the server and restarting the pc but nothing seems to work. my pc recognizes the phone and the adb process only appears briefly when i try to start the server. also, it gets stuck on wating for device when i type "fastboot oem unlock"

Looks like windows is messing up the ports (reserving them). I have the same issue with docker containers and this worked for me:
Run this in the command line (as administrator)
net stop winnat
adb.exe start-server
net start winnat

Happened with me as well. Just check there might be an existing adb process running in your task manager. Just kill the process and run the 'adb start-server' command.
Hope it helps

Happened to me today.
I realized it happened when I started Android Studio after having my Genymotion emulator running, so I fixed it by closing everything (even check task manager for a running instance of adb).
After closing everything, I opened Android Studio first and then the emulator and everything was ok.

In my case the issue was in IntelliJ IDEA plugin - Aladdin Logcat. Turned it off and everything works now.

This happened to me because I had Oculus Developer Hub open.
Even if you're not using its adb features, it will constantly try to start its own version of adb and kill the one you're trying to launch.

ADB server can't start android

I have installed adt bundle eclipse. However, I can't seems to run the AVD. I have the problem of
ADB server didn't ACK
failed to start daemon
I have search on how to solve it, I've read to type adb kill-server and adb start-server. when I typed that, it says
adb server is out of date. killing...
ADB server didn't ACK
* failed to start daemon *"

Please follow below steps:-
Go to run
open command prompt
get into your platform-tools under android sdk.
now type command: adb kill-server
then upon success type: adb start-server
Thats'it.
Let me know if you still facing any issue..

I had this exact problem on my Vista x64 system. I solved it by doing the following:
Ctrl-Alt-Del, start Task Manager, under Processes tab, check for "shuame_helper.exe". It was there from running RootGenius. I clicked End Process, then went back to the command prompt and entered adb start-server and it worked!

Try below step from DDMS in eclipse :

So I had the same problem and failed in all the same ways as above:
adb kill-server
followed by
adb start-server
still resulted in the ADB server didn't ACK error.
The other common suggestion of using the task manager to kill the process also
failed as it seemed that something restarted adb automatically? It would disappear for a second, then there were two adb processes ,then there was one again.
Exasperated.
I restarted Windows in safe mode.
This ensured that adb wasn't started.
Shut down and restart normally. Problem solved.
Just for good measure, I also updated eclipse and android at this point, but I think that the safe mode restart fixed it.
Give it a try when all else fails.

When this happens I open Activity Monitor (on mac) or Task Manager (on windows) and look for the ADB process and force close it (sometimes there are more than one, close those to) and then press the Run button again in Android Studio or Eclipse.

1)Open task manager first
2)close any instance of adb.exe(end task it)
3)open command prompt
4) type adb start-server(you may have to execute it twice)
5) try to run now.

I had this problem using the latest ADT, SDK and Eclipse on Windows 7. I had an old ASUS TF101 and an HTC HD connected with their respective docking software. When I looked in processor tab of the Windows task manager I could see two instances of the adb.exe, one loaded and another one looking like it is trying to load.
I killed the PC connecting software (process in task manager) for the ASUS, the HTC Sync wasn't running. There is now one adb.exe running and both devices are recognised in Eclipse and in the command prompt (adb devices). You may need to restart Eclipse.

Adb server not responding [duplicate]

This question already has answers here:
Eclipse error "ADB server didn't ACK, failed to start daemon"
(23 answers)
Closed 4 years ago.
I am a Android newbie. I guess I might be doing something stupid here. I have started the Virtual Device and I see that adbd daemon is running from the Terminal Emulator. When I run adb devices I get the following error:
C:\Program Files\Android\android-sdk\tools>adb devices
* daemon not running. starting it now on port 5037 *
ADB server didn't ACK
* failed to start daemon *
error: cannot connect to daemon
No other process is using port 5037. What am I doing wrong? Here are the packages I have installed -
1) Android SDK Tools, revision 10
2) Android SDK Platform-Tools, revision 3
3) SDK Platform Android 2.3.3, API 10, revision 1

This will occur normally,if abd is not able to launch properly and didn't exit when adb kill-server is executed.
So if in Windows
1. Go to Task Manager (CTRL+ALT+DEL)
2.look for adb.exe and end the process.
Now restart the emulator ,should work properly.
additionally you can close and launch the development environment also (eg: Eclipse or NetBeans).

I suspect the problem is cause of many adb instances (in windows) , i usually face this problem cause i don't turn off my system so the adb process may not end properly.
So open task manager choose Process tab just search for adb.exe, right click on it and choose End Process Tree rather than just End Process

Had the same problem, it seems that my security solution was blocking adb.exe

this is not the right folder for adb : lately adb has moved from /tools to /platform-tools in the sdk folder.

Seems like the security program is blocking adb.exe, so go to the adb file path and open adb's properties, then check the Run this program as administrator setting.

In my case the process adb.exe starts when i connect the phone, and then when I adb devices then I have your problem, and killing the process does not help it is resurrecting like a stubborn zombie, as long as the phone is connected.
so my solution was to disconnect the phone, then kill adb.exe process, then start it by adb devices and connect the phone
After that when i command adb devices i ma getting the same prompt about killing adb out of date, but this time on the second line is * daemon started sucessfully*
win xp
htc sensation
the new eclipse adt sdk bundle from google so i suppose up to date.

I found there was a process call "Tadb.exe" in Windows Task Manager.
I guess Tadb.exe is a similiar adb application of Tencent. Because I got an alert of "android device detected by QQ" after I install the last version of Tencent QQ2013 Beta5 (6970) yesterday.
After I killed the Tadb.exe, the original adb.exe of Android SDK works again.
You can see the detailed proecss to solve this problem here:
adb cannot run, adb server is out of date

I turned off the Windows Firewall and its working like magic. I am connected to the Internet through WiFi. If you are not behind a proxy and are still unable to access the Internet through a wireless link via the emulator, go to Device Manager and disable your LAN card.

As I have tried as follow by combining omni.present's method , and finally emulator works fine.
firstly I stop adb.exe process in the task manager
then I stop and start eclipse

The fundamental reason is because the 5037 port on your machine to be occupied by a process, not only Android devices can not use adb connection ios device not use iTunes.
Can query process and close it, netstat / a / o maybe can help you to take up to 5037 ports.
To windows7 the LogsAndAlerts service will occupy port 5037.