好久没用真实设备调试了，现在的高版本 Android 都自带了 WIFI 调试，也不需要什么 root 权限，还是比较方便的，但今天连接的时候一直报错：

failed to connect to '192.168.31.71:40206': Connection refused

就很莫名其妙，以往都这么用，怎么突然就不行了，重启下 adb 试了下，也是一堆错：

ADB server didn't ACK
Full server startup log: /var/folders/89/cb_s5g296qbdc4gpthvczgfm0000gn/T//adb.501.log
Server had pid: 54694
--- adb starting (pid 54694) ---
adb I 08-07 13:13:48 54694 12330329 main.cpp:63] Android Debug Bridge version 1.0.41
adb I 08-07 13:13:48 54694 12330329 main.cpp:63] Version 31.0.2-7242960
adb I 08-07 13:13:48 54694 12330329 main.cpp:63] Installed as /usr/local/bin/adb
adb I 08-07 13:13:48 54694 12330329 main.cpp:63] 
adb E 08-07 13:13:48 54694 12330332 usb_osx.cpp:161] Unable to create an interface plug-in (e00002be)
adb E 08-07 13:13:49 45749 11396835 usb_osx.cpp:161] Unable to create an interface plug-in (e00002be)
adb F 08-07 13:13:49 54694 12330329 main.cpp:156] could not install *smartsocket* listener: Address already in use

* could not start server *

既然如此，纵使再莫名其妙，不过一个重装大法：

brew reinstall android-platform-tools

以上。