Please Help me????????

Basically you want a keep-alive signal?

Do you have the server source? If you do, you could create a linked-link and hold the times in there, checking every once in a while...

Do you have the client source? You can do the same in it really...

With the points you've listed above, you must consider this a very difficult problem, so I'm probably missing the whole picture. Would you be more detailed please?

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How are you keeping track of the clients, and which IO strategy are you using  ? Asynchronous ? blocking ? or event based ? completion ports ?.

Depending on that it might be trivial or a bit difficult to implement what you are trying to do. You need to keep track of in-active time for each client, after it hits a threshold send a signal to the client and reset the in-active time (if the need be). This would be easily accomplished in non-blocking modes.

>> how to find out the port is ideal for some time?

What eactly do you mean by that ?

Dear srinivasanmr

I think you forgot this question. I will ask Community Support to close it unless you finalize it within 7 days. You can always request to keep this question open. But remember, experts can only help you if you provide feedback to their questions.
Unless there is objection or further activity,  I will suggest to

     "PAQ at zero points"

since you never gave more feedback.

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!
======
Werner