Android Studio Update to 2.3.3 - android

I updated the android studio to 2.3.3 from 2.2.3 now when opening the existing projects it shows the following error.
Error:Could not HEAD 'https://jcenter.bintray.com/com/github/dcendents/android-maven-gradle-plugin/1.3/android-maven-gradle-plugin-1.3.pom'. Received status code 407 from server: Proxy Authentication Required
Enable Gradle 'offline mode' and sync project
How to fix it? Can anyone help.

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Problem with my project on android studio

I am trying to edit a project on android studio, but I keep getting these errors:
Could not HEAD 'https://chartboostmobile.bintray.com/Chartboost/com/tapjoy/tapjoy-android-sdk/12.8.0/tapjoy-android-sdk-12.8.0.pom'.
Received status code 502 from server: Bad Gateway
Disable Gradle 'offline mode' and sync project
also it is telling me to upgrade Gradle version, the current version is 4.2.2
Could not HEAD 'https://chartboostmobile.bintray.com/Chartboost/com/tapjoy/tapjoy-android-sdk/12.8.0/tapjoy-android-sdk-12.8.0.pom'. Received status code 502 from server: Bad Gateway Disable Gradle 'offline mode' and sync project
This is caused by bad net connect. You could download the sdk directly from the offical site and manually integrate it via referring to this guide.
also it telling me to upgrade gradle version the current version is 4.2.2
This is only a suggestion and not mandatory.

Unable to create & sync android project in mac with android studio 3.1.4

Unknown host 'jcenter.bintray.com: nodename nor servname provided, or not known'. You may need to adjust the proxy settings in Gradle.
Enable Gradle 'offline mode' and sync project
Learn about configuring HTTP proxies in Gradle
if I do it in offline mode getting different errors
these are my gradle files tried different build tool versions in last few days but non working please help.

Android Studio Error : Unknown Host 'service.gradle.org'

I was working on a project on Android Studio 3.0 Beta 2 when suddenly i get the following error in my console:
Error:Unknown host 'service.gradle.org'. You may need to adjust the proxy settings in Gradle.
Enable Gradle 'offline mode' and sync project
Learn about configuring HTTP proxies in Gradle
I haven't made any changes to my gradle. I have tried invalidating caches and restarting Android Studio to no avail. I have restarted my computer as well but still no luck.
What's causing this to show up and how can i solve this?
I realized there was a typo and was supposed to be services.gradle.com instead of service.gradle.com. I don't know how this happened since the gradle-wrapper.properties file wasn't open but that was the issue.

Android Studio gradle couldn't sync

I have upgraded android studio from 1.4 to 2.1 and my existing projects couldn't sync with the below gradle error
Error:Connection timed out: connect. If you are behind an HTTP proxy, please configure the proxy settings either in IDE or Gradle.
I am not using any proxy and I have made sure not to use proxy from the android studio IDE. but it keeps on coming with the same error and no idea how to fix this.
I am stack on this and would appreciate any one who could shade some light on this

gradle project sync failed in android studio | how to fixit it?

im a new in android studio, I simply created a new project, and it says that:
Gradle project sync failed. Basic functionality will not work properly.
The Error Message Is:
Error:Connection timed out: connect. If you are behind an HTTP proxy, please configure the proxy settings either in IDE or Gradle.
you can see this screenshot :
please help me to fix this problem !

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