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What if two applications use the same port?
The short answer is “no, not on the same host.” The only time it would make sense to have multiple applications listening on the same port is if a single application were not sufficient to service all the incoming requests. …
Can a process listen on multiple ports?
Yes, a single process can listen on multiple ports, just like 80 + 443 are done. Apache has different ways to the handle the requests, the so called MPM (MultiProcessingModules). Usually you have single process and then multiple threads handling the requests as they are comming in.
Can you bind more than one application to a port at a time?
Only one application can bind to a port at a time, and behavior if the bind is forced is indeterminate. With multicast sockets — which sound like nowhere near what you want — more than one application can bind to a port as long as SO_REUSEADDR is set in each socket’s options.
Can you listen to two applications on the same port?
Two applications can certainly listen on the same port. But the socket for each connection can not be bound to the same IP address on the same port. As a developer, you sometimes need to have 2 or more applications running locally on your machine that communicate with each other.
How are web apps run on the same port?
Accepted connections are then dispatched to different applications in an unspecified (i.e. random) way. IIS can run multiple web-apps on the same port because it opens the port once in kernel mode and dispatches connections to its worker processes.
How does an application know it has to send information to a different port?
And if the answer is that that’s only their default port – how will an application know it has to send information to a different port? For example – if iis will listen on port 81 because Skype is listening on 80 – how will anyone requesting a web page know to send the request to theip:81 as opposed to theip:80?