Now I got following error message:
Server Error in '/' Application
The section <authentication> can't be defined in this configuration file (the allowed definition context is 'MachineToApplication'). (/home/xxx/public_html/xxx/PL/web.config line 32)
Description: HTTP 500. Error processing...
I wrote this line in the .htaccess in the public_html AND added
Mime Type: application/mono
Extension(s): .aspx .ascx .asax .ashx .config .cs .asmx .axd in the cPanel
AND it definately DOESN`T ****ING WORK!!!!