Check If Client Port Is Open And Forwarded [C#]?
Jan 29, 2010
What is the best way to check if client has an open port, and if it's forwarded properly?The app works like this currently:Client creates a socket for incoming connections and wants to notify everyone about his open port. Client also tries to setup port forwarding using UPnP (but it's not always present and enabled).Client then sends his port to the "central" known server.Server should check if the port is open (forwarded properly) and return its status.If there is a forwarding problem, client will notify user.The goal is to have an the IP + port info saved on the server to be able to give it to other clients. I could try to open a Socket from server to client and see if it fails, but is there an easier (faster) way to do it?For example, this site does something like that: http://www.canyouseeme.org/
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