Session problem mongrel behind Apache proxy

Hi,

I've configured mongrel_clusters behind an Apache 2.2 proxy using named virtual host. Session are saved as ActiveRecordSession. But the cookies created on client side doesn't correspond to session data saved in database (keys are different). The RoR app react just like it doesn't have a session at all.

If I don't use Apache as a proxy/load balancer and call directly Mongrel_cluster, everything works well.

What should I do to get session working with Mongrel behind an Apache proxy/load balancer ?

**** Extract of my Apache config *****

# Setup a cluster for each application <Proxy balancer://myapp>     BalancerMember http://10.1.4.22:3000     BalancerMember http://10.1.4.22:3001     BalancerMember http://10.1.4.22:3002 </Proxy>

<VirtualHost 10.1.4.22:80>     ServerName myapp.xxxxxxxx.yyy     DocumentRoot /srv/www/rails/myapp/public

    <Directory "/srv/www/rails/myapp/public">         Options FollowSymLinks         AllowOverride None         Order allow,deny         Allow from all     </Directory>

    # The root of this virtual host redirect to Portal application     ProxyPass / balancer://myapp/     ProxyPassReverse / balancer://myapp/     ProxyPreserveHost on

    # Make all of the /public/images directory served by Apache     ProxyPass /images !     Alias /images /srv/www/rails/myapp/public/images

    # Setup your Rewrite rules here     RewriteEngine On

    # Rewrite index to check for static     RewriteRule ^/$ /index.html [QSA]

    # Send all requests that are not found as existing files to the cluster     RewriteCond %{DOCUMENT_ROOT}/%{REQUEST_FILENAME} !-f     RewriteRule ^/(.*)$ balancer://myapp%{REQUEST_URI} [P,QSA,L]

    # Error logs     ErrorLog /var/log/apache2/myapp_error_log     CustomLog /var/log/apache2/myapp_access_log combined </VirtualHost>>

**** END ****

Thanks,

Nist