Post installation

After i`ve configured my site and everything seems running fine, i noticed a problem: i try to open my site in my browser (www.marco-kleinert.de), I only get a blank page. when I browse to any page in my site (www.marco-kleinert.de/?q=node) everything is fine. there are no errors in the log and I can navigate to any page without a problem. Only the direct link to my domain doesn´t work!

Where´s the problem?

Thanks Marco

Quoting
"(named by default PHPSESSID, but it can be changed)"

So this means that cookie name changing is not possible ???
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Look at this picture and you'll know what I mean. http://morjens.net/drupal/drupal.jpg

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Thanks