Android Studio: Gradle sync failed: Could not HEAD '...'. Received status code 502 from server: Bad Gateway

After update Android Studio to latest version (3.1) and gradle version in my project I get an error (the link is always different):

12:54	Gradle sync started

12:56	Gradle sync failed: Could not HEAD 'https://jcenter.bintray.com/com/android/tools/analytics-library/shared/26.1.0/shared-26.1.0.jar'. Received status code 502 from server: Bad Gateway 			Consult IDE log for more details (Help | Show Log) (1m 56s 602ms)

12:56	Gradle sync started

12:57	Gradle sync failed: Could not HEAD 'https://jcenter.bintray.com/org/codehaus/mojo/animal-sniffer-parent/1.14/animal-sniffer-parent-1.14.pom'. Received status code 502 from server: Bad Gateway 			Consult IDE log for more details (Help | Show Log) (1m 4s 266ms)

12:58	Gradle sync started

12:59	Gradle sync failed: Could not HEAD 'https://jcenter.bintray.com/com/sun/activation/all/1.2.0/all-1.2.0.pom'. Received status code 502 from server: Bad Gateway 			Consult IDE log for more details (Help | Show Log) (1m 29s 985ms)

13:01	Gradle sync started

13:02	Gradle sync failed: Could not HEAD 'https://jcenter.bintray.com/com/sun/activation/javax.activation/1.2.0/javax.activation-1.2.0.pom'. Received status code 502 from server: Bad Gateway 			Consult IDE log for more details (Help | Show Log) (4s 976ms)

Android Studio version:

Android Studio 3.1
Build #AI-173.4670197, built on March 22, 2018
JRE: 1.8.0_152-release-1024-b02 amd64
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
Windows 10 10.0

I already tried clean rebuild and update gradle, restart Android Studio and PC, but without success. Any ideas?

PS: of course I have internet. Also, if you open a link in the browser - the file is downloaded.

jcenter is having issues at the moment, please check http://status.bintray.com/

EDIT: it looks like the link above was sunset, new link at: https://status.gradle.com/

>After updating the Android Studio to 3.1.0 ,

I just had the same problem, i resolved it using

 maven {   url "https://maven.google.com"  }

to the TopMost buildScript like this in project-level gradle :-

 buildscript {
    repositories {
      .....
      ...
     maven {   url "https://maven.google.com"   }

> For reference take a sample of the project-level gradle:-

buildscript {

  repositories {
      google()
      jcenter()
      maven { url 'https://maven.fabric.io/public' }
      maven { url 'https://jitpack.io' }
      mavenCentral()
      maven { url 'https://maven.fabric.io/public' }
      maven {  url "https://maven.google.com"  }
  }
 dependencies {
     classpath 'com.android.tools.build:gradle:3.1.0'
     classpath 'io.fabric.tools:gradle:1.24.4'
   }
}

 allprojects {
   repositories {
      google()
      jcenter()      
   }
 }

task clean(type: Delete) {
    delete rootProject.buildDir
}

Note :- One more thing:-

In gradle-wrapper.properties use this :-

  distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip

Instead of 4.1-all.zip .

Edit :- If you want to resolve the issue fast , you can also try adding these - according to Omar's answer :-

 maven { url "http://dl.bintray.com/riteshakya037/maven" }

along with

  maven { url "https://maven.google.com" }

Thanks to everyone for the quick answers!

It seems like temporary network issues on the "jcenter.bintray.com" website. I just clicked "Try Again" many times and in the end everything was updated.

Also, if you open the links in the browser - from time to time you will receive a "Service Error" message. So the problem is not on your side.

Ok, I slove it by:

In your build.gradle project level, add this:

buildscript {
    ...
repositories {
    google()
    jcenter()
    maven { url 'https://maven.fabric.io/public' }
    maven { url 'https://jitpack.io' }
    mavenCentral()
    maven { url "https://maven.google.com" }
}
dependencies {
    classpath 'com.android.tools.build:gradle:3.1.0' // Updated from 3.0 to 3.1.0

    // NOTE: Do not place your application dependencies here; they belong
    // in the individual module build.gradle files
}}

Note that I've updated gradle from 3.0 to 3.1.0

Next: add the same previous links to allprojects's repository body:

allprojects {
repositories {
    google()
    jcenter()
    mavenCentral()
    maven { url 'https://jitpack.io' }
    maven { url "https://maven.google.com" }
    maven { url 'https://maven.fabric.io/public' }
}

}

One more thing:

In gradle-wrapper.properties use this :

distributionUrl=https://services.gradle.org/distributions/gradle-4.4-all.zip

After that, just sync again, and it will work.

Tip:
When you get your project to build correctly the once enable offline-mode so AS don't have to connect to jcenter every gradle refresh.

For me after applying Santanu Sur's answer The error hapenned again but with another library I have check project's gradle and I found this line maven { url "http://dl.bintray.com/riteshakya037/maven" } in

allprojects {
    repositories {
        maven { url "http://dl.bintray.com/riteshakya037/maven" }
        maven { url "https://jitpack.io" }
        jcenter()
        google()
    }
}

I deleted it, and everything is good now

I've just clicked Disable Gradle 'offline mode' and sync project and Android Studio downloaded all the needed files.

It's a server response error. Keep trying by pressing "Try Again" after some time. It will be ok automatically.

Uninstalling and Download & install from Developer site solved the issue for me.