Can't get Redis to work with WordPress on Vserver running Ubuntu 20.04.4 LTS

Hi,

I´m struggeling to get Redis to work with the Redis Object Cache plugin for WordPress and hoping someone can give me some advice.

For me it seems Redis is working correct:

When trying to activate the Object Cache in WordPress this fails:

It’s the well know Connection refused issue … but I don’t see why as Redis is running.

Status: Not connected
Client: PhpRedis (v5.3.7)
Drop-in: Valid
Disabled: No
Ping:
Connection Exception: Connection refused (RedisException)
Errors: [
“Connection refused”
]
PhpRedis: 5.3.7
Relay: Not loaded
Predis: Not loaded
Credis: Not loaded
PHP Version: 7.4.29
Plugin Version: 2.0.25
Redis Version: Unknown
Multisite: No
Metrics: Disabled
Metrics recorded: null
Filesystem: Working
Global Prefix: “u1b9Tti_”
Blog Prefix: “u1b9Tti_”
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”,
“wordfence”,
“wordfence-ls”,
“avada”
]
Unflushable Groups:
Drop-ins: [
"advanced-cache.php v by ",
"maintenance.php v by ",
“Redis Object Cache Drop-In v2.0.25 by Till Krüss”
]

Any advice is very welcome. Thx a lot in advance
Michael