Reverse Inbound Proxy Web Auth

[mcamino]

Hello. I am looking for a method to do the following. i did not find any solutions when i search the forum already. I have a web server running in our LAN which we need to publish on the internet, but we do not want everyone to have access to it. What we want to setup is basically a reverse proxy with authentication. we would point our internet users to a http://ip.add.here:port number.... they would be greeted by a login splash page where they type their username/password, and then it will allow them to view our webpage on the lan. Any suggestions on guides on how to accomplish this?