Hello, How do you now socket has been closed ? have you done some tcpdump compare between wroking and non-working system ?
May be some users are going out thru a proxy that remove the keep-alive ? regards. r> Hello, r> I have a Delphi 6 application that talks to an external device that acts as an HTTP server. I am using the ICS TWSocket components for this application. I open up a socket to talk to the device r> and handle the necessary header and body crafting to talk to the server. In other words, I am not using the ICS HTTP client component but using the lower level TWSocket component and handling the r> necessary HTTP "handshaking" myself. r> The headers I craft and send to the external device have the keep-alive flag set to TRUE. On my system, after I send anything to the external device, the connection will stay open continuously and r> will not close until approximately 30 seconds of inactivity occurs (30 seconds where I don't make any requests of the external device as an HTTP server). I don't know if the external device closes r> it or if Microsoft Windows does it. But the important point is that normally I can do multiple sends and the connection will stay open until I send nothing for about 30 seconds. This works fine r> and is what my code expects. r> However, on some of my users systems the socket is closing after every send. I do have code that checks for a closed socket and attempts a reconnect to the external device if necessary, but does r> not expect to have to do a reconnect with each transaction. r> My questions are: r> Is there a system setting for sockets that might be causing this anomalous behavior on some users systems? r> If so, are there Windows API function calls I can use to query the offending parameter and then set it to the expected close on 30 seconds of inactivity instead of with each transaction? r> If so, can I, or how do I do it in a manner that will not adversely affect any other programs running on the users system? r> Thanks, r> Robert r> -- r> To unsubscribe or change your settings for TWSocket mailing list r> please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket r> Visit our website at http://www.overbyte.be -- To unsubscribe or change your settings for TWSocket mailing list please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be
