Till Krüss on "[Plugin: Redis Object Cache] Object Cache enabled, Status:Not Connected ,Client:predis"

Support Team,

I'm trying to configure Redis Object Cache plugin, for bitnami AMI on wordpress, to connect to Elasticcache Redis server.

1) I've declared the variable in wp-config
define( 'WP_REDIS_SCHEME', 'tcp' );
define( 'wp_REDIS_PORT', '6379' );
define( 'WP_REDIS_CLIENT', 'predis' );
define( 'WP_REDIS_DATABASE', '0' );
define( 'WP_REDIS_HOST', '***************.cache.amazonaws.com' );

2) I get on to Redis Object Cache Settings,

Status: Disabled
Client: predis

Click on Enable Object Cache, it immediately takes me to FTP account login to enter the password, after entering the password, I get redirected back to the Redis Object Cache Settings page.

(Object Cache Enabled)

Status:Not Connected ,
Client:predis

3) Points to be noted here
- object-cache.php is copied to the wp-content
- I'm able to connect to redis cache server from redis-cli command line on the EC2 server
- I tried giving 777 and ownership change, no luck .

Could you please help me providng further leads, as to why I get Not Connected error ?

https://wordpress.org/plugins/redis-cache/