【onlinelog错误处理】listener-thread: err = -25580

错误信息：

15:20:06  listener-thread: err = -25580: oserr = 107: errstr = : System error occurred in network function.
 System error = 107.
16:20:06  listener-thread: err = -25580: oserr = 107: errstr = : System error occurred in network function.
 System error = 107.
17:20:06  listener-thread: err = -25580: oserr = 107: errstr = : System error occurred in network function.
 System error = 107.

错误原因：Python或其他程序定时通过数据库端口建立tcp连接，监控端口可用性。

解决方案：停止程序定时建立tcp连接，可使用tcpdump排查报错时刻哪台服务器在创建tcp连接。