Android Studio appears waiting for ADB

CMD enters the command line and enters the directory where the ADB is located:

The ghost problem arises as follows.

C:\USERS\XXXX>ADB start-server ADB Server is an out of  date.  killing ... ADB server didn ' t ACK  * Failed to start daemon *  

ADB either executes the shell devices or Logcat will error

ADB server is an out of date.  Killing ...  

　　

The source is the ADB server did not start

Check it out on the StackOverflow. Analyzed and collated as follows:

C:\USERS\XXXX>ADB Nodaemon Server  cannot bind ' tcp:5037 '  

　　

Original ADB server port binding failed

Continue to see which port is in use.

The original is 5620 this PID occupied, open Task Manager, view, check the PID, see is the KDB this program, online search is said to be cool dog East, not much use, direct right button end process, start again

ADB Nodaemon Server  

Ok!!!

Android Studio appears waiting for ADB