Allow The User To Send A Message To An Application?

Dec 3, 2009

So im trying to allow the user to send a message to an application on a server telling it to do different things. So i build the client and the server side applications and tested them on my computer and another computer here. Everything worked great, just like i wanted it to.

When I moved the server application to the actual server and tried connection via the internet, it did not work. I got the error message: An error has occured : A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond IPADDRESS:PORT

Well then I realized chances are a VPN connection to my server and using my servers name instead of my servers IPADDRESS would fix this problem, which it did.

I dont want to require the user to have to create a VPN connection, i dont really care reather they use the IPaddress or not, although if theres a fix for that too it would be great. Heres my code: (I have marked where the error occured)

''Client
Imports System.Net.Sockets
Imports System.Net
Imports System.Text

[Code]....

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[Code]...

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[code].....

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[Code]...

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Public Class Form1
Dim color As Integer
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[code].....

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I have used a couple of tutorials around the web, but they differ to what i actually require. They all seem based around the whole "client must connect first" thing, is this really necessary? I just need each user to be a "server" constanly listening to any message recieve on a specific port, and display it in a popup when one is.

At the moment the code i have sort of works, but its a bit flakey and doesnt handle the initial connection/final disconnect very well.

Client program (team leaders console):

Form:

Imports System.Net
Imports System.Net.Sockets

[CODE]...

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[code].....

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[code]....

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