无法使用python连接到数据库服务器

Question

这是我在C＃中的连接字符串：

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appSettings>
    <add key="dbcon" value="Data Source=aServer;Failover Partner=bServer;Initial Catalog=enggdb;Persist Security Info=True;User ID=tt;Password=bb123;" />
  </appSettings>
</configuration>

我的C＃程序能够连接到服务器，但是，我的python程序无法连接

代码：

import mysql.connector

failoverConfig = {
                'user': 'tt',\
                'password': 'bb123',\
                'database': 'enggdb',\
                'host': 'bServer',\
                }

config = {
        'user': 'tt',\
        'password': 'bb123',\
        'host': 'aServer',\
        'database': 'enggdb',\
        #'failover': [failoverConfig ],\
        }

 conn = mysql.connector.connect(**config)

在禁用故障转移服务器的情况下，出现以下错误：

errno=2003, values=(self.get_address(), _strioerror(err)))
InterfaceError: 2003: Can't connect to MySQL server on 'aServer:3306' (10060 A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond)

启用故障转移服务器后，出现以下错误：

raise InterfaceError("Could not failover: no MySQL server available")
InterfaceError: Could not failover: no MySQL server available

请告知。