adb cannot connect to daemon at tcp:5037

Question

My adb can't connect devices. I am runing adb start-server

    ulucudeMacBook-Pro:~ ulucu$ adb start-server     * daemon not running. starting it now at tcp:5037 *     * daemon started successfully * 

Then run "lsof -i tcp:5037"

    ulucudeMacBook-Pro:~ ulucu$ lsof -i tcp:5037     COMMAND  PID  USER   FD   TYPE             DEVICE SIZE/OFF NODE NAME     adb     2308 ulucu    7u  IPv4 0x440443a862048a7b      0t0  TCP localhost:5037 (LISTEN) 

But when I run adb kill-server

    ulucudeMacBook-Pro:~ ulucu$ adb kill-server     * server not running * 

or run adb devices or adb shell

    List of devices attached     * daemon not running. starting it now at tcp:5037 *     adb E 03-31 09:30:26  2350 95705 usb_osx.cpp:333] Could not open interface: e00002c5     adb E 03-31 09:30:26  2350 95705 usb_osx.cpp:294] Could not find device interface     error: could not install *smartsocket* listener: Address already in use     ADB server didn't ACK     * failed to start daemon *     error: cannot connect to daemon 

The adb has been running.
No other processes using "5037" port.
No other simulator like "genymotion".
My system is Mac 10.12.14.
My adb version is 1.0.39.

What's the problem?

Answer 1

If you have updated to Platform Tools 25.0.4(you can check running android from command line) and it's not working

Just download previous stable version e.g: https://dl.google.com/android/repository/platform-tools_r25.0.2-macosx.zip

Then go to your Android SDK home directory and replace platform-tools folder with the downloaded one.

Then do:

ps aux | grep 5037 kill -9 <pid of process of your incorrectly running adb> 

And go

adb devices