If you're telling Apache to listen on a different port for your reverse proxy, do make sure you add that entry to your ports.conf file.

Once you've created the virtual host declaration for the reverse proxy site, you need to reload Apache. Remember, if you're using Ubuntu, you need to create a symbolic link so that Apache reads your ...

I don't fully grok the apache proxy settings, but I think the <Proxy> block is not required at all for a reverse proxy. The <Location> blocks control access in this case.