[pmwiki-users] farm security

[Hans]

I set up a pmwiki farm in a farm directory.
Everything works fine, but I can access various folders
directly through the browser, like the farm/script/ directory and the
farm/ directory and the farm/cookbook/  directory.
And I can run pmwiki from the icon in the filelist.
Surely this is not right and I wonder where I went astray in
all the file reshuffle to get this farm working.
What is missing?
  
Thanks in advance!

~Hans