I guess you haven't found/read all posts about this problem..

Your server isn't properly set up.

PATH_INFO is the part after the php script:
http://hilbertpostma.nl/concrete5.3.3.1/phpinfo.php/pathInfoTest...

pathInfoTest should be the content of PATH_INFO but in your case the server never returns a result when I open it with the PATH_INFO part appended.

Ok but how can i fix the problem? If I make a file named PATH_INFO with correct PHP code in it. And place it on my server wil that work?

no, your have to fix your server configution. httpd.conf or try to add AcceptPathInfo to .htaccess

apache stuff

AcceptPathInfo was already in
.Htaccess. what about
httpd.conf? I've read on wikipedia that it has to do with apache (apache stuff). But I do not host my website on my own computer. I host my website at mijndomein.nl. Inwww.www.hilbertpostma.nl/phpinfo.php... and then PHP Variables / _SERVER [ "SERVER_SOFTWARE"] it says that there is apatch on my server. Can I solve the problem by my self? Or should I contact my provider? Or is there another solution?

ask your provide.. It sounds like you're not very familiar with Apache.

Just send them the link I've posted above and ask them what you can do to get a result.

Appending /bla to a php script must work.

i uploaded a blank htaccess file to the server. when i entered AcceptPathInfo and saved, i refreshed the site to find an internal server error as opposed to the path_info error as before. i am a newb with concrete, so sorry for the silly question. but what exactly should my htaccess file look like?

As a quick side note: Godaddys Free Windows hosting seems to give these errors but their paid doesn't. Newer versions and better support on paid?

actually their paid hosting is giving me these errors too.. I'm waiting for a response from them on how to resolve the issue.

I'm having the same issue installing Concrete, it looks to me (after many hours of tracing) that AcceptPathInfo is not available in Apache 1.3.41... i understand it's only available in => Apache 2.0. I can't seem to find a workaround just yet but the only fixes i can think of will either be trying to get the host to upgrade Apache (unlikely) or to somehow create a .htaccess file in the server root and see if settings can be applied that way...

or in short: Check which version of Apache your host is running...if it's less than 2.0 this is likely to be why your getting path_info errors