Unable to resolve dependency for ':[email protected]/compileClasspath':....

新換的mac，各方面配置好後，打開老項目也沒問題，建項目時出現如下報錯，總感覺是系統各方面沒配置好的問題，總是小題大作。。。

我打開vpn翻下牆。重新Rebuild一下就OK了 

Error:Unable to resolve dependency for ':[email protected]/compileClasspath': Could not resolve com.android.support:appcompat-v7:26.1.0. Open File

Show Details

Error:Unable to resolve dependency for ':[email protected]/compileClasspath': Could not resolve com.android.support.test:runner:1.0.1. Open File

Show Details

Error:Unable to resolve dependency for ':[email protected]/compileClasspath': Could not resolve com.android.support.test.espresso:espresso-core:3.0.1. Open File

Show Details

Error:Unable to resolve dependency for ':[email protected]/compileClasspath': Could not resolve com.android.support:appcompat-v7:26.1.0. Open File

Show Details

Error:Unable to resolve dependency for ':[email protected]/compileClasspath': Could not resolve com.android.support:appcompat-v7:26.1.0. Open File

Show Details

Error:Unable to resolve dependency for ':[email protected]/compileClasspath': Could not resolve com.android.support:appcompat-v7:26.1.0. Open File

Show Details

Error:Unable to resolve dependency for ':[email protected]/compileClasspath': Could not resolve com.android.support:appcompat-v7:26.1.0. Open File

Show Details

點選詳情檢視：

1. Unable to resolve dependency for ':[email protected]/compileClasspath': Could not resolve com.android.support:appcompat-v7:26.1.0.

Could not resolve com.android.support.test:runner:1.0.1.

Required by:

    project :app

 > Could not resolve com.android.support.test:runner:1.0.1.

    > Could not get resource 'https://dl.google.com/dl/android/maven2/com/android/support/test/runner/1.0.1/runner-1.0.1.pom'.

          > Could not GET 'https://dl.google.com/dl/android/maven2/com/android/support/test/runner/1.0.1/runner-1.0.1.pom'.

                   > Connect to 127.0.0.1:50176 [/127.0.0.1] failed: Connection refused (Connection refused)

                               > Connection refused (Connection refused)