I need to be able to test access to certain applications (ports) from external to inside. The application will be available via url which translate internally. How though, can I test a certain application (or port it will use) on a server without installing the application? http would be easy since all that is needed is to create a website on a app server, but what about https or another port that the app needs?
Would I use a free certificate for the https?
Also, for an application that uses for example port 1234. how would I be able to test that the url being accessed from outside would reach its destination internally using that port number without installing the 3rd part application on the web server?
url>>>firewall nat>>>internal webserver listening on port 1234