Thread:Manual talk:Short URL/Apache/"300 Multiple Choices"/ common basename error - what now?

My media wiki installation is located at /w on shared server with no root access.

I have configured my .htaccess (located in /w/) file with the help of http://shorturls.redwerks.org so it reads like this

I have changed my LocalSettings.php to

It should be accessed via the domain http://spookyverse.de. The domain settings point to the /w directory. When I now access the wiki via the domain, the main pages works, although the link http://spookyverse.de/index.php?title=Hauptseite instead of http://spookyverse.de/wiki/Hauptseite, not sure if this another sign of my issue. However when I try to access any article from the main page or from previously bookmarked links (for example http://spookyverse.de/wiki/Drehorte) page I get the message

I guess there is still something wrong with my .htaccess but as you can probably guess by using the redwerks tools I have no idea what exactly these rule (and I'm) are doing and why it won't work.

My hosting support told me to have the domain point to an extra folder with a .htaccess file (and only there) which contains

which will cause a loop/ too may redircets error.

I will be forever grateful for any help since unfortunately I do not understand the logics of regular expressions, I have tried for days now to fix this with manuals around the web, but no luck.