using AWS elastic Redis cache for wordpress

Hi, I came across critical error in wordpress while trying to add a aws elastic cache using redis plugin.

This is the error in wordpress debug.log

[03-May-2023 22:29:13 UTC] PHP Fatal error:  Uncaught RedisException: Connection refused in /var/www/html/wordpress/wp-content/object-cache.php:726

1. I tested accessing my redis access point. It was working.
2. Php-redis installed and tested.
3. double check I added following in wp-config file:

define('WP_CACHE_KEY_SALT', 'your-unique-salt-here');
define('WP_CACHE', true);
define('WP_REDIS_HOST', '<aws-redis-access-point>');
define('WP_REDIS_PORT', '6379');

any advice on this?

PS: I tried recovering the site by deactivate plug-in with following steps:

1. renamed wp-contect/plug-in folder to plug-in.deactivate
2. change database wp_options table active_plugins row tp option_value field to: a:0:{}

But the site is showing critical error. Any thing else I should do about it?