not connected status

please help me to find the problem in installing redis on my server with unix socket
the steps I did is the next
1- redis already installed on server and its extension phpredis
Client: PhpRedis (v4.2.0RC3)
Redis Extension: 4.2.0RC3
Predis Client: 1.1.1
PHP Version: 7.2.12
2- I installed Redis Object Cache plugin for wordpress
3- I added the next lines to wp-config.php
define(‘WP_REDIS_CLIENT’, ‘predis’);
define(‘WP_REDIS_SCHEME’, ‘unix’);
define(‘WP_REDIS_PATH’, ‘///home/sys/redis.sock’);
define(‘WP_REDIS_DATABASE’, ‘0’);
define(‘WP_CACHE_KEY_SALT’, ‘wp_’);
define(‘WP_REDIS_SELECTIVE_FLUSH’, ”);
define(‘WP_REDIS_MAXTTL’, ‘86400’);
define(‘WP_REDIS_DISABLED’, ”);
4- I copies object-cache.php file from the /plugins/redis-cache/includes/ directory to the /wp-content/ directory
the result in plugin page that it is (not connected)
[cid:f4188e76-a040-40a0-af07-fe8450713c32]
so please help me to find the missing part (why it is not connected ?)
thanks and best regards