I did the following:
Apologies for the delay in this response and thank you for your question.
The gradle-wrapper.properties file under the gradle/wrapper directory has the distribution Url set to one of our proxies.
This should not be in the file and has been left over while developer build local versions of the app for testing.
Please Remove the line shown below: distributionUrl=https\://artifactory.intercede.com/artifactory/simple/ext-release-local/gradle/gradle/2.8/gradle-2.8-all.zip
We will also remove this line in a future build of the Sample App.