How to do reconnect socket when port closed or idled?

Posted on 2007-03-30
Medium Priority
Last Modified: 2008-05-10
Hi Experts,
I am using winsock to work with Socket for MFC Window application.
I used port 8000 to connect to socket server,

Can you give some suggestion about how to do re-connect to server when server port 8000 is closed or idled for some reason?

Many thanks!

Question by:CongUan
  • 2
LVL 11

Accepted Solution

Deepu Abraham earned 500 total points
ID: 18822475
You could use closesocket and try reconnecting.Also make sure that you have set tcp linger option (using setoption()) off while creating the socket.
Best Regards,
LVL 11

Expert Comment

by:Deepu Abraham
ID: 18822484
LVL 39

Assisted Solution

itsmeandnobodyelse earned 500 total points
ID: 18836625
>>>> how to do re-connect to server when server port 8000 is closed or idled
I never heard of a "idled" port.

From my experience you must do nothing special. A  port or network device deactivated by an administrative action should be available again after it activated again. That may last a little time as TCP/IP is an asynchronously running subssystem.

The main problem maybe is that your prog needs to be able to handle such cases, i. e. instead of leaving a read or write operation in an undefined state it must identify the error returned a previous action as an error which might be temporary only and do periodically recalls, e. g. like that:

    int count = 0;
    while (true)
           if (!readFromSocket())
                 if (lastError == FATAL || ++count > MAX_RETRY)
                       exit(1);         // leave prog in case of a fatal error
                Sleep(1000);      // sleep a second

The lastError and readFromSocket used above are assumed to be members of an appropriate class.

Regards, Alex

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