Laravel 4.1 on nginx routes error 404 - php

Question

I am having troubles with the routes of laravel on a nginx Server.
It shows a "404 not found" for all the routes, except for the default one, very similar to this problem: nginx configuration for Laravel 4
The solution to that problem:
server {
listen 80;
server_name sub.domain.com;
set $root_path '/srv/www/htdocs/application_name/public';
root $root_path;
index index.php index.html index.htm;
try_files $uri $uri/ #rewrite;
location #rewrite {
rewrite ^/(.*)$ /index.php?_url=/$1;
}
location ~ \.php {
fastcgi_pass 127.0.0.1:9000;
fastcgi_index /index.php;
include /etc/nginx/fastcgi_params;
fastcgi_split_path_info ^(.+\.php)(/.+)$;
fastcgi_param PATH_INFO $fastcgi_path_info;
fastcgi_param PATH_TRANSLATED $document_root$fastcgi_path_info;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
}
location ~* ^/(css|img|js|flv|swf|download)/(.+)$ {
root $root_path;
}
location ~ /\.ht {
deny all;
}
}
it works well, the only problem is that i need the root_path to be /srv/www/htdocs because I have other projects running there to.
Whenever i change the line:
set $root_path '/srv/www/htdocs/application_name/public';
to:
set $root_path '/srv/www/htdocs';
the problem starts on url's like: localhost/application_name/public/users