Call back: 404 error page not found

Yes to do the test, I created an address: 127.0.0.2:5000, which I tested by pinging; The address successfully answers. My question is do I have to have a particular configuration.? The context of my project is as follows: Our team works in a local network (intranet) and we have to communicate with external partners. we cannot give direct access to our servers, So we want to make rediirection in order to communicate with the web services of the parties on the Internet without going through VPN.

i need help please