Apache2 (CKAN) + TOMCAT6 + Mod Proxy Problems - apache

Question

Apache2 (CKAN) + TOMCAT6 + Mod Proxy Problems
Hello,
I have a server running CKAN over Apache2, this server also have a tomcat6 hosting some HTML pages. Apache is running in 8080 and Tomcat in 8081. Nginx is used to make Apache accessible through port 80.
I have a web in the tomcat served in
http://195.57.27.91:8081/arboles
I would like to make this web accessible through the port 80 so I use Mod Proxy from Apache2 to make a internal proxy that redirects the incoming request asking for /arboles to port 8081. This has been done by using http.conf like this:
LoadModule proxy_module /usr/lib/apache2/modules/mod_proxy.so
LoadModule proxy_http_module /usr/lib/apache2/modules/mod_proxy_http.so
ProxyRequests Off
ProxyPreserveHost On
<Proxy *>
Order deny,allow
Allow from all
</Proxy>
ProxyPass /arboles http://195.57.27.91:8081/arboles/
ProxyPassReverse /arboles http://195.57.27.91:8081/arboles/
In do know this Proxy is working because I have tried it in another server with another domain successfully.
PROBLEM:
When I try to resolve the URI:
http://195.57.25.27/arboles
It doesn't load the page. All I get is 504 Gateway Error Time-out.
I have checked the Apache2 logs and there is no track of error or misconfiguration, I don't know what else to try. Any ideas?
EDIT: I forgot to mention nginx log:
2014/01/31 10:39:28 [error] 13921#0: *321 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 158.49.219.193, server: , request: "GET /arboles/ HTTP/1.1", upstream: "http://127.0.0.1:8080/arboles/", host: "opendata.caceres.es"
Note: opendata.caceres.es is the domain name for the server.

Answer 1

Ok, finally I have solved the problem (props to Ross Jones for pointing out the idea).
Basically what I have done is redirect the URIS that have /arboles in their path to port 8081 by using nginx instead of Apache2. To do that I've modified my sites-enabled in /etc/nginx (I also could have add another site) to add the following redirection:
location /arboles {
proxy_pass http://127.0.0.1:8081/arboles/;
proxy_set_header Host $host;
proxy_cache_key $host$scheme$proxy_host$request_uri;
}
Hope this can be interesting for somebody in the future.
NOTE: if you don't have conf files in sites-enabled & sites-available you can make this changes in the conf.nginx file.
Jesús.