Sry for bringing up this topic, but unfortunately the older / other answers did not help.
Usually I am running my dev-projects locally, pushing them to mysite.com/clientname later to show them to the client.
On the Server I created a subdirectory called clientname, where I put the all files.
I further updated the .htaccess to
RewriteBase /clientname (this is everything I changed there)
In another thread I read you could (or should?) update the config.php as well, so I included
I tried the .htaccess in the root directory as well as the /clientname directory.
But unfortunately I am just getting an HTTP ERROR 500.
Thanks in advance