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Editorial Team
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Asked: 2026-05-31T17:30:23+00:00

I am making a C# client / Java server chatroom, and everything works fine

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I am making a C# client / Java server chatroom, and everything works fine now, except for one thing:
After some time (an hour or so) of not using the application (or using it, I don’t know) it gives me a SocketException at the C# client at the socket.EndReceive() function:

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

Do Java or C# socket connections closes after some time of idling? Or is it just the tcp protocol?
What would be the best method to fix it?

Thanks all!

Bas

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1 Answer

  1. Editorial Team

    Do Java or C# socket connections closes after some time of idling?

    No.

    However, firewalls and especially NAT gateways do, often silently.

    What would be the best method to fix it?

    Implement a heartbeat procedure. i.e. the client and/or server periodically sends (e.g. every 10 or 30 or so seconds) a special message that’s just used to keep the connection alive and to faster detect a failed peer.

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