"jcenter.bintray.com:443 failed to respond" error in Android Studio

Try setting both http and https as shown below

gradlew -Dhttp.proxyHost=127.0.0.1 -Dhttp.proxyPort=8080 -Dhttps.proxyHost=127.0.0.1 -Dhttps.proxyPort=8144

EDIT1 :

Gradle is trying to download jars from https repo "https://jcenter.bintray.com" but java does not have client certificates. Follow below steps to import client certificates

Step 1 : Download Client Certificate

a)  Open https://jcenter.bintray.com URL in the browser (i.e firefox)
b) Click on the lock icon right to the URL bar
c) Server URL is shown , click to get right arrow and then on "more information"
d) Pop-up is opened to view the certificate of the Server.
e) click on the "View Certificate", In "details" table export to a file CERT_FILE_NAME.crt

Step 2 : Import the client certificate to JDK which Gradle is using

keytool -import -noprompt -trustcacerts -alias "clojars.org" -file C:\CERT_FILE_NAME.crt -keystore C:\java\jre\lib\security\cacerts -storepass "changeit"