我正在尝试使用 pymysql 远程连接到 MySQL，但收到错误消息：
(2003, "Can't connect to MySQL server on 'ip address' ([WinError 10061]
No connection could be made because the target machine actively refused it)")
在我的 my.cnf 文件中，我将绑定地址设置为 0.0.0.0 并且跳过网络不存在。运行 "sudo netstat -atn" 显示端口 3306 仅在 localhost 上侦听：
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:3306 0.0.0.0:* LISTEN
我的防火墙允许来自 3306 的流量：
To Action From
-- ------ ----
22/tcp ALLOW Anywhere
22/udp ALLOW Anywhere
80/udp ALLOW Anywhere
80/tcp ALLOW …我是初学者,所以解决方案可能是微不足道的.我只是想学习,应用程序正在崩溃,null pointer exception但我无法看到它可能在哪里.这是logcat:
01-31 05:36:30.434: D/AndroidRuntime(1824): Shutting down VM
01-31 05:36:30.434: W/dalvikvm(1824): threadid=1: thread exiting with uncaught exception (group=0xb3aceb90)
01-31 05:36:30.454: E/AndroidRuntime(1824): FATAL EXCEPTION: main
01-31 05:36:30.454: E/AndroidRuntime(1824): Process: com.thecloset, PID: 1824
01-31 05:36:30.454: E/AndroidRuntime(1824): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.thecloset/com.thecloset.MainActivity}: java.lang.NullPointerException
01-31 05:36:30.454: E/AndroidRuntime(1824): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2102)
01-31 05:36:30.454: E/AndroidRuntime(1824): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2226)
01-31 05:36:30.454: E/AndroidRuntime(1824): at android.app.ActivityThread.access$700(ActivityThread.java:135)
01-31 05:36:30.454: E/AndroidRuntime(1824): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1397)
01-31 05:36:30.454: E/AndroidRuntime(1824): at android.os.Handler.dispatchMessage(Handler.java:102)
01-31 05:36:30.454: E/AndroidRuntime(1824): at android.os.Looper.loop(Looper.java:137)
01-31 05:36:30.454: E/AndroidRuntime(1824): at android.app.ActivityThread.main(ActivityThread.java:4998)
01-31 …