AS（Android Studio）报错：Connection refused: connect

新机器win，调试科大讯飞程序，下载后执行。
报错：
Connection refused: connect
Connect to localhost:80 [localhost/127.0.0.1, localhost/0:0:0:0:0:0:0:1] failed: Connection refused: connect

Could not resolve com.android.tools.build:gradle:3.0.1.
Required by:
project :
Could not resolve com.android.tools.build:gradle:3.0.1.
Could not get resource ‘https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/3.0.1/gradle-3.0.1.pom’

1、解决办法：
登录官网：www.gradle.org
详见：Gradle的下载与安装教程

2、后来发现缺少JDK，安装配置好后，依然报错。

3、按照https://blog.csdn.net/XING979020/article/details/88372324
依然报错。