policy.conf

# Add this to your nginx.conf under http { }

    server {
        listen 843;
        server_name localhost;
        
        location / {
	    rewrite ^(.*)$ /crossdomain.xml;
	}

	error_page 400 /crossdomain.xml;

	location = /crossdomain.xml {
	    root /var/www/crossdomain;
	}
    }

# In /var/www/crossdomain, create a crossdomain.xml file:

<?xml version="1.0"?>  
  
<!DOCTYPE cross-domain-policy SYSTEM "http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd">  
  
<cross-domain-policy>  
  <allow-access-from domain="*" secure="false" to-ports="*"/>  
  <site-control permitted-cross-domain-policies="master-only" />  
</cross-domain-policy>