kvm 遇到的错误ERROR 验证安装位置出错：打开 URL ftp://127.0.0.1/centos7u3 失败：[Errno 111] 拒绝链接。Cannot set up guest

错误1： The ERROR validation installation position ERROR: failed to open the URL ftp://127.0.0.1/centos7u3:111] [Errno rejected the connection. ERROR 验证安装位置出错：打开 URL ftp://127.0.0.1/centos7u3 失败：[Errno 1

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