title: android studio 3.0 Error:Could not resolve all files for configuration
body: <p><strong><code>android studio 3.0</code></strong> <code>error</code></p>
  
  <p>Error:Could not resolve all files for configuration ':app:debugCompileClasspath'.</p>
  
  <blockquote>
    <p>Could not resolve com.android.support:appcompat-v7:26.1.0.
      Required by:
          project :app
    Could not resolve com.android.support:appcompat-v7:26.1.0.
    Could not get resource '<a href="https://dl.google.com/dl/android/maven2/com/android/support/appcompat-v7/26.1.0/appcompat-v7-26.1.0.pom" rel="nofollow noreferrer">https://dl.google.com/dl/android/maven2/com/android/support/appcompat-v7/26.1.0/appcompat-v7-26.1.0.pom</a>'.
    Could not GET '<a href="https://dl.google.com/dl/android/maven2/com/android/support/appcompat-v7/26.1.0/appcompat-v7-26.1.0.pom" rel="nofollow noreferrer">https://dl.google.com/dl/android/maven2/com/android/support/appcompat-v7/26.1.0/appcompat-v7-26.1.0.pom</a>'.
    Connect to dl.google.com:443 [dl.google.com/172.217.17.110] failed: Connection timed out: connect
    Could not resolve com.android.support:appcompat-v7:26.1.0.
    Could not get resource '<a href="https://jcenter.bintray.com/com/android/support/appcompat-v7/26.1.0/appcompat-v7-26.1.0.pom" rel="nofollow noreferrer">https://jcenter.bintray.com/com/android/support/appcompat-v7/26.1.0/appcompat-v7-26.1.0.pom</a>'.
    Could not GET '<a href="https://jcenter.bintray.com/com/android/support/appcompat-v7/26.1.0/appcompat-v7-26.1.0.pom" rel="nofollow noreferrer">https://jcenter.bintray.com/com/android/support/appcompat-v7/26.1.0/appcompat-v7-26.1.0.pom</a>'.
    Connect to jcenter.bintray.com:443 [jcenter.bintray.com/159.122.18.156] failed: Connection timed out: connect</p>
  </blockquote>