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Editorial Team
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Asked: 2026-05-21T10:23:32+00:00

Im trying to write a chat app with the push-model but up to now

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Im trying to write a chat app with the push-model but up to now I have only done so in a intranet-environment with a self-hosted wcf-service (using duplex net.tcp). Now I want to place this server online in IIS7. I have checked with a number of hosting providers but all have replied with something like: “No we dont have net.tcp activated and we probably never will activate it”. Why are they so reluctant in doing so? It seems I have to get my own virtual server? But what risks am I facing using net.tcp for IIS7? What other options do I have? I have checked out “WebSockets” but it doesnt seem to be ready yet and Im not sure if its a solution in my case. Im not writing a HTML5-chat but a windowed chat for the desktop.

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  1. Editorial Team

    Well there are a few potential problems

    1. By opening a new port the firewalls will need adjusted.
    2. By listening on TCP the attack surface of your application has increased.
    3. Each customer would have to be managed so they don’t try to take the same port number.
    4. TCP requires connections to stay open, increasing load on the server.
    5. If machines are behind a NAT that complicates things too

    Note that you can use HTTP for duplex communications, using WSDualHttpBinding

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