Max connections per IP

Problem

Hi, we want to use the node-http-proxy in combination with express. Our setup ist the following: Main server: - express listening on port 443 - node-http-proxy listening on port 84 and forwards to 443 Proxy server - node-http-proxy listeing on port 443 and forwards to main server port 84 or another tomcat server Clients - clients connect to proxy server - depending on the url, they are routed to main server or tomcat server - if routet to main server the connection is kept open for about 30 seconds (long-polling) Everything works fine if our clients connect directly to the main server. If they connect over the proxy server we can have 5 request and nothing else happens until those requests are closed. We have to be able to connect a minimum of 500 clients by long polling. Any way we can manage this? Thanks for your help.