Firefox 3.0.6 - Bad Request - Fehlemeldung

Hallo Community
Habe folgendes Problem mit dem Firefox 3.0.6.

Wenn ich versuche auf die Seite "www.kwick.de" zu gelangen, kommt folgende Fehlermeldung:

400 Bad Request


Bad Request

Your browser sent a request that this server could not understand.
Size of a request header field exceeds server limit.

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Apache Server at all.kwick.de Port 80

Wenn ich dann die Cookies lösche und aktualisiere, kommt die Seite ganz normal.
Wenn ich aber dann Firefox neustarte und öffne komme ich auf meine startseite google.de und wenn ich dann auf www.kwick.de gehe kommt wieder die fehlermeldung bis ich die cookies lösche..

Wenn ich die cookies lösche und dann den firefox neustarte und nochmal auf kwick.de gehe kommt die fehlermeldung nochmal..

Beim Internet Explorer 7 habe ich das Problem nicht.
Weiß einer woran das möglicherweise liegen könnte?

grüße!