title: Gradle sync failed: Could not resolve all dependencies for configuration ':app:debugRuntimeClasspath'
body: <p>I recently update my Android Studio to version 3.0.1 and I started a new project with a blank activity. As soon as the gradle sync starts(as soon as I open the project)I get a message in Event Log :</p>
  
  <pre><code>Gradle sync failed: Could not resolve all dependencies for configuration ':app:debugRuntimeClasspath'.
                  Could not determine artifacts for com.android.support:appcompat-v7:26.1.0
                  Could not get resource 'https://dl.google.com/dl/android/maven2/com/android/support/appcompat-v7/26.1.0/appcompat-v7-26.1.0.aar'.
                  Could not HEAD 'https://dl.google.com/dl/android/maven2/com/android/support/appcompat-v7/26.1.0/appcompat-v7-26.1.0.aar'.
                  Connect to dl.google.com:443 [dl.google.com/216.58.197.46] failed: Connection refused: connect
                  Connection refused: connect
                  Consult IDE log for more details (Help | Show Log) (3s 878ms)
  </code></pre>
  
  <p>I reinstalled the support repository from Android SDK manager and adding maven to the dependencies but so far have been unable to resolve the issue.</p>
  
  <p>The build-gradle:</p>
  
  <pre><code>// Top-level build file where you can add configuration options common to all sub-projects/modules.
  
  buildscript {  
   repositories {
      google()
      jcenter()
  }
  dependencies {
      classpath 'com.android.tools.build:gradle:3.0.1'
  
      // NOTE: Do not place your application dependencies here; they belong
      // in the individual module build.gradle files
   }
  }
  
  allprojects {
   repositories {
      google()
      jcenter()
      maven { url "https://maven.google.com" }
      }
  }
  
  task clean(type: Delete) {
   delete rootProject.buildDir
  }
  </code></pre>
  
  <p>app level build-gradle:</p>
  
  <pre><code>apply plugin: 'com.android.application'
  
  android {
   compileSdkVersion 26
   defaultConfig {
      applicationId "com.example.vishalbisht.test"
      minSdkVersion 15
      targetSdkVersion 26
      versionCode 1
      versionName "1.0"
      testInstrumentationRunner 
   "android.support.test.runner.AndroidJUnitRunner"
  }
  buildTypes {
      release {
          minifyEnabled false
          proguardFiles getDefaultProguardFile('proguard-android.txt'), 
  'proguard-rules.pro'
      }
   }
  }
  
  dependencies {
   implementation fileTree(dir: 'libs', include: ['*.jar'])
   implementation 'com.android.support:appcompat-v7:26.1.0'
   implementation 'com.android.support:design:26.1.0'
   implementation 'com.android.support.constraint:constraint-layout:1.0.2'
   testImplementation 'junit:junit:4.12'
   androidTestImplementation 'com.android.support.test:runner:1.0.1'
   androidTestImplementation 'com.android.support.test.espresso:espresso-
   core:3.0.1'
  }
  </code></pre>