RewriteRules -> Proxyproblems

[gnome11]

hallo leut

ich hab einige fragen, bekam im IRC leider keine antworten...
ich benuetze zur Zeit Plone ueber Apache, leider funktioniert das RewriteRule nicht richtig, hier die passende config:

NameVirtualHost IP:80
<VirtualHost IP:80>
DocumentRoot /var/www/
ProxyRequests on
ProxyVia on
RewriteEngine on
RewriteLog /var/log/rewritelog.log
RewriteLogLevel 9
RewriteRule ^/(.*) http://host.domain.tld:8080/VirtualHost ... ostRoot/$1 [P,L]
</VirtualHost>


I get always that error:
Forbidden
You don't have permission to access / on this server.

without Proxy i mean with [L] only it works.. thats just a redirection.. i want URL to be rebuild with Port 80..

Could someone pls help??

thx
gianni