solved.
the settings in the wp-config.php were added to the end of the file, but had to be defined earlier.
thank you for your time!
Thank you Till for your fast reply,
Diagnostic Section:
PHP Version: 7.0.12
Multisite: No
Redis: 3.0.0-rc1
Predis: 1.1.1
Status: Not Connected
Client: PECL Extension (v3.0.0-rc1)
WP_REDIS_SCHEME: "unix"
WP_REDIS_PATH: "\/data\/sockets\/redis\/e*****-259.sock"
WP_CACHE_KEY_SALT: ""
Drop-in: Valid
Global Prefix: "bbha_"
Blog Prefix: "bbha_"
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"]
Ignored Groups: ["counts","plugins","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","themes"]
