How to set up apache with fastcgi and a simple test script?

It's been a few days that I'm trying to set up fastcgi with apache on a Kubuntu server. Despite searching everywhere, I cannot make it to work. If I try to run the site with the cgi application, apache hangs and after the timeout returns a 500 error.

Here is what I did:

• I made sure that mod_fastcgi is installed and enabled:

  # pwd
  /etc/apache2/mods-enabled
  # ls -l f*
  lrwxrwxrwx 1 root root 30 2010-07-22 10:01 fastcgi.conf -> ../mods-available/fastcgi.conf
  lrwxrwxrwx 1 root root 30 2010-07-22 10:01 fastcgi.load -> ../mods-available/fastcgi.load
  

• As far as I am aware, fastcgi.conf is properly configured:

  <IfModule mod_fastcgi.c>
    AddHandler fastcgi-script .fcgi
    #FastCgiWrapper /usr/lib/apache2/suexec
     FastCgiIpcDir /var/lib/apache2/fastcgi
  </IfModule>
  

• I am using this very simple sample script to test the set up:

  #include <iostream>
  using namespace std;
  int main()
  {
          cout<<"Content-type: text/plain"<<endl<<endl;
          cout<<"Hello World!"<<endl;
           return 0;
  }
  

• I compiled it. It works fine from the command line.
• I placed it within a folder visible from the web server: http://127.0.0.1/fcgitest/run.fcgi
• At first I get: "Forbidden. You don't have permission to access /fcgitest/run.fcgi on this server.".

• I add a .htaccess file in the folder:

  Options +ExecCGI -Indexes
  

• And now, when I try to access the script address from my web browser, I get the symptom I described at the beggining: the browser first hangs, and after the timeout, I get a 500 Internal Server Error.

• The apache error.log say:

  Content-type: text/plain
  Hello World!
  [Sat Aug 28 09:08:23 2010] [warn] FastCGI: (dynamic) server 
  "/var/www/fcgitest/run.fcgi" (pid 27758) terminated by calling exit with status '0'
  

It seems the output is written to the error logs!! Is there a missing socket configuration, somewhere??