Can’t activate the Object cache after successful install

Hi,

we’ve installed the plug-in as per instructions in the wp-config.php (we have a different port and IP for redis). Redis seems to be available and the filesystem writeable.

However, when we wan’t to activate the object cache on the Redis settings page, we get a red notification that this is not possible (no further information is given in the notice). I’ve added a screenshot of the notice and the diagnose info.

Any idea what is going on or how we can make it work? Maybe we forgot something?

Cheers & have a great day!