proxypassreverse with concrete

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I would like to run concrete from within a vmserver appliance. For other such setups, I have been very happy with an apache configuration for the main server (not the appliance) like:

# Concrete web page (underscores not really there)                                                            
ProxyPass /concrete h_t_t_p://192.168.29.133/concrete
ProxyPassReverse /concrete h_t_t_p://192.168.29.133/concrete
ProxyPreserveHost On


Unfortunately, with concrete -- due I believe to some mod rewrite stuff within concrete -- I get the following error:

Firefox has detected that the server is redirecting the request for this address in a way that will never complete.


With out the ProxyPassReverse the site will render, but I want to hide the local IP in the url from the outside for obvious reasons.

Any help with such a setup?