suPHP returns internal server error

Hi,

I have a plesk 9.5 server on a debian server.
I tried to install suphp, but it returns 500 internal server error.

There are nothing in the suphp log but i see this in the apache serverlog:
Premature end of script headers: index.php

I have checked that the executable is the cgi version of php.
php5-script="php:/usr/bin/php5-cgi"

/usr/bin/php5-cgi -v
PHP 5.2.4-2ubuntu5.10 with Suhosin-Patch 0.9.6.2 (cgi-fcgi) (built: Jan 6 2010 21:52:56)
Copyright (c) 1997-2007 The PHP Group
Zend Engine v2.2.0, Copyright (c) 1998-2007 Zend Technologies

On Debian is a different settings, what we do manually usually :-(
Our solution descriobed is for CentOS.

To cboxdk:

There are faster solutions to run PHP as a domain user in Plesk than suPHP or PHP+FastCGI :

* mpm-itk (used by many Apache users for years);
* mod_ruid2 (mysql_pconnect can cache open connections);
* mpm-peruser (as fast as mpm-prefork but complex configuring).

Shareware GUI turning on/off mpm-itk or mod_ruid2 on Plesk domain:

"Run PHP as User" http://forum.parallels.com/showthread.php?t=106297

Documentation: http://helixdevelopment.com/dl/rau/1.1.1/doc/
Order: http://helixdevelopment.com/products.html
Trial version for Linux: http://helixdevelopment.com/dl/rau/1.1.1/eval/

Compatible Plesk versions:
* Plesk 8 for Linux
* Plesk 9 for Linux
* Plesk 10 for Linux

Thank you very much

very welcome.