Async Socket.. Client not responding after processing server side request for more than 1 hr

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C#

sockets

Can any one please help me understand , when my scoket at client end is not sending the response back to server socket . Here is the scenario

1.Server send request

2.Client receives the request

3.After receiving request , Client starts some process and runs for more than 1 hr

4.After completion of process execution , client has to send the response back to server

5.so , server can send immediately another request in Queue to client for process..

In Client side, we are usig Begin Accpet, Begin Receive, and Send methods... and Server side we are using Send and receive methods of Async call

if the process completes before one hour then client is sending and server r is sending the next request to client to start process no issues.., only issue is if the process runs for more than 1 hr then only client is not able to send back / server is not receiving the client response .. not sure..

Please help to resolve this issue .