Problems with adb.exe - AdbHostServer.cpp:93: Unable to connect to adb daemon on port: 5037

Question

I have a problem with adb.exe of Android Studio 3.4.

When I run the emulator, I get this error:

Emulator: emulator: ERROR: AdbHostServer.cpp:93: Unable to connect to adb daemon on port: 5037

I opened a terminal with the rute of the adb.exe: C:\Users\Christian\AppData\Local\Android\Sdk\platform-tools

And here I tried with adb kill-server and then adb start-server and I get this:

*daemon not running; starting now at tcp:5037
*daemon started successfully

When i run again the same error appears, i get this in terminal with the command adb devices:

List of devices attached
emulator-5554   offline

I emulate Nexus 5X API 28 with System Image: Pie 28 x86 Android 9.0.

I download the last version of abd.exe in for Windows

I also reinstalled the Android Studio and the emulator, but the error still appears.

How can I solve that?

Answer 1

You need to first run adb start-server and then run emulator -avd <avd_name>

Answer 2

I had this happen with the following Event Log entry:

Emulator: emulator: ERROR: AdbHostServer.cpp:102: Unable to connect to adb daemon on port: 5037

So I opened command prompt as administrator and ran netstat -a -b >c:\connections.txt and found the following:

 [Amazon Music Helper.exe]
  TCP    127.0.0.1:5037         jbiss-PC:0             LISTENING
 [adb.exe]
  TCP    127.0.0.1:5037         jbiss-PC:54858         ESTABLISHED
.
.
.
[ss_conn_service.exe]
  TCP    127.0.0.1:51146        jbiss-PC:5037          CLOSE_WAIT
.
.
.
 [adb.exe]
  TCP    127.0.0.1:54858        jbiss-PC:5037          ESTABLISHED

So I shut down Amazon Music Helper, shut down and restarted Android Studio and then launched the emulator. It works now. I'm not sure why I started having this problem today, I assume that Amazon Music Helper was involved previously and the status indicated ESTABLISHED for adb.exe, but I did, and this process cleared it up for now at least.