playframework - Enable https for play framework -

i wish enable https on site based on play framework.

i have below settings in conf/application.conf described in documentation play version 2.3.x in https://www.playframework.com/documentation/2.3.x/configuringhttps

# https settings https.port=9443 https.keystorepath=/home/username/.keystore/example.jks https.keystoretype=jks https.keystorepassword=mysecurepassword https.keystorealgorithm=rsa 

however, when hit https://example.com:9443/ error "err_connection_refused" in chrome. there wrong in configuration?

appreciate pointers/help on this.

note: have created keystore , installed certificate there.