Cache is not connected

Hi there,

I’m trying to connect the Redis cache on WPEngine for that I’ve disabled their object caching & then cleared their cache & tried again but the cache status was saying not connected. I’m not getting anything why it’s not connected seems my site has Redis installed for sure. It’s a multisite I want to share. Here’s the diagnostic report for investigation:

Status: Not connected
Client: PhpRedis (v5.3.1)
Drop-in: Valid
Disabled: No
Ping: 
Connection Exception: Connection refused (RedisException)
Errors: [
    "Connection refused"
]
PhpRedis: 5.3.1
Predis: Not loaded
Credis: Not loaded
PHP Version: 7.4.13
Plugin Version: 2.0.17
Redis Version: Unknown
Multisite: Yes
Filesystem: Working
Global Prefix: ""
Blog Prefix: 1
WP_REDIS_PREFIX: "55e5c766c6db56e4"
WP_CACHE_KEY_SALT: "55e5c766c6db56e4"
Global Groups: [
    "blog-details",
    "blog-id-cache",
    "blog-lookup",
    "global-posts",
    "networks",
    "rss",
    "sites",
    "site-details",
    "site-lookup",
    "site-options",
    "site-transient",
    "users",
    "useremail",
    "userlogins",
    "usermeta",
    "user_meta",
    "userslugs",
    "redis-cache"
]
Ignored Groups: [
    "counts",
    "plugins",
    "themes",
    "blog-details",
    "blog-id-cache",
    "blog-lookup",
    "global-posts",
    "networks",
    "rss",
    "sites",
    "site-details",
    "site-lookup",
    "site-options",
    "site-transient",
    "users",
    "useremail",
    "userlogins",
    "usermeta",
    "user_meta",
    "userslugs",
    "redis-cache",
    "blog_meta"
]
Unflushable Groups: []
Drop-ins: [
    "advanced-cache.php v by ",
    "Redis Object Cache Drop-In v2.0.17 by Till Krüss"
]

Enabling this would create some fatal errors also

166 PHP Fatal error:  Uncaught Error: Call to a member function get() on null in /nas/content/live/ladybossmaster/wp-content/object-cache.php:611\nStack trace:\n#0 /nas/content/live/ladybossmaster/wp-content/object-cache.php(387): WP_Object_Cache->get_generation('default')\n#1 /nas/content/live/ladybossmaster/wp-content/object-cache.php(309): WP_Object_Cache->key('last_changed', 'sites')\n#2 /nas/content/live/ladybossmaster/wp-content/object-cache.php(72): WP_Object_Cache->get('last_changed', 'sites')\n#3 /nas/content/live/ladybossmaster/wp-includes/functions.php(7090): wp_cache_get('last_changed', 'sites')\n#4 /nas/content/live/ladybossmaster/wp-includes/class-wp-site-query.php(340): wp_cache_get_last_changed('sites')\n#5 /nas/content/live/ladybossmaster/wp-includes/class-wp-site-query.
php(254): WP_Site_Query->get_sites()\n#6 /nas/content/live/ladybossmaster/wp-includes/ms-site.php(464): WP_Site_Query->query(Array)\n#7 /nas/content/live/ladybossmaster/wp-includes/ms-load.php(255): get_sites(Array)\n#8 /nas/content/live/ladybossmaster/wp-in in /nas/content/live/ladybossmaster/wp-content/object-cache.php on line 611

Can you help us here?