【解决】Unable to connect to any of the specified MySQL hosts.
一般是由于语法错误，如数据库的服务器IP地址填写有错误，但如果在一台机子上不报错，另一台机子上运行时就报错，则是由于防火墙的原因，请调整相应的防护策略。 笔者在本机上能运行，后来迁移到服务器上，发现无法运行，仔细一想，是防火墙的原因。 后来将相应的端口开放后，可以正常使用了，我的MySQL服务端口是6603
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