Does mod_cluster and Named Virtual Hosts work?

I've assumed that mod_cluster works by "magic" :-)

On the back-end I have
JBOSS_GOSSIP_PORT=12001
JBOSS_GOSSIP_REFRESH=5000
JBOSS_SERVER_PEER_ID=226
# Comma-separated list of address:port for mod_cluster front-end proxies
JBOSS_PROXY_LIST=<front-end-ip>
JBOSS_IP=<back-end-ip>
JAVA_HOME=/usr

(Note - I didn't put a port the end of the fron-end-ip)

On the front end, I've turned NamedVirtualHosts on, and have /etc/httpd/conf.d/v_vhost_name.conf

<VirtualHost *:80>
ServerName <v_host_name>

ManagerBalancerName mycluster
ServerAdvertise off

<Proxy *>


ErrorLog logs/<vhost_name>.error_log
CustomLog logs/<vhost_name>.access_log common


I know that the front-end is using this virtual host because of the logs, and on the back end I know I've got virtual hosts working in JBoss 5.0.1 on the back end (checked using telnet).

But - proxying isn't working. 404s from the front end for everything (except an empty FancyIndex for /). I take it mod_cluster doesn't work automagically and I've missed something?