BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Connection problems using TCP/IP sockets under Vista          BorlandTalk.com Forum Index -> Delphi Internet Winsock View previous topic :: View next topic   Author Message Arnau Font Guest Posted: Thu May 10, 2007 2:45 pm    Post subject: Connection problems using TCP/IP sockets under Vista Hi group, I've developed a server application that receives TCP/IP connections using a TIdTCPServer from some devices located in the local network. These devices are not PCs. Under XP everything goes fine, but under Windows Vista this TCP/IP connections become invalid after some hours, even though the socket does not raise an exception, it just stops receiving information. Data is being sent every 4 seconds through the socket. Does anybody have an idea why this happens? Thanks! Back to top Remy Lebeau (TeamB) Guest Posted: Thu May 10, 2007 11:17 pm    Post subject: Re: Connection problems using TCP/IP sockets under Vista "Arnau Font" <afont (AT) nospam_really_ipssoft (DOT) com> wrote in message news:4642e982 (AT) newsgroups (DOT) borland.com... Quote: Under XP everything goes fine, but under Windows Vista this TCP/IP connections become invalid after some hours How are you determining that exactly? Quote: even though the socket does not raise an exception Are you sure about that? You are not catching exceptions in your own code, are you? Quote: it just stops receiving information. Highly unlikely, unless the devices actually disconnected from the server. Gambit Back to top Arnau Font Guest Posted: Fri May 11, 2007 1:13 pm    Post subject: Re: Connection problems using TCP/IP sockets under Vista "Remy Lebeau (TeamB)" <no.spam (AT) no (DOT) spam.com> ha escrit en el missatge dels grups de discussió:464361a6$1 (AT) newsgroups (DOT) borland.com... Quote: "Arnau Font" <afont (AT) nospam_really_ipssoft (DOT) com> wrote in message news:4642e982 (AT) newsgroups (DOT) borland.com... Under XP everything goes fine, but under Windows Vista this TCP/IP connections become invalid after some hours How are you determining that exactly? The device sends me periodically a keepalive command (something like a NOOP in a FTP) to be sure that the connection is still alive. If my server doesn't receive any command like this in a specified time, we suppose that the connection has been broken. When this happens, I raise in the server a IdException with a special message (yes, I should have inherited from IdException, but...) and register it in the EventViewer from Windows. I get an error event randomly. Quote: even though the socket does not raise an exception Are you sure about that? You are not catching exceptions in your own code, are you? I use the TIdTCPServer OnException event, and I do register separetely all TIdExceptions and the rest of exceptions, so I'm sure that my exceptions doesn't mess in all this. Quote: it just stops receiving information. Highly unlikely, unless the devices actually disconnected from the server. Until now, this only happened when you take out the LAN cable. The server didn't notice that the connection was broken. Apart from all this, the important thing is that in Windows 2000 and XP this worked, but in Vista doesn't... Thanks, Arnau. Back to top Remy Lebeau (TeamB) Guest Posted: Sat May 12, 2007 1:52 am    Post subject: Re: Connection problems using TCP/IP sockets under Vista "Arnau Font" <afont (AT) nospam_really_ipssoft (DOT) com> wrote in message news:46442584 (AT) newsgroups (DOT) borland.com... Quote: The device sends me periodically a keepalive command (something like a NOOP in a FTP) to be sure that the connection is still alive. If my server doesn't receive any command like this in a specified time, we suppose that the connection has been broken. Can you show your server code that is reading the data? Did you verify with a packet sniffer, such as Ethereal, that no data is actually reaching the machine and you are just not reading it correctly? Quote: Until now, this only happened when you take out the LAN cable. The server didn't notice that the connection was broken. It is not supposed to. WinSock was never designed to handle pulling out the physical cable, and most systems don't issue out notifications or invalidate active sockets when you do so. Hense the need for manual timeouts in order to detect such abnormal disconnects. Quote: Apart from all this, the important thing is that in Windows 2000 and XP this worked, but in Vista doesn't... Then I suggest you take it up with the Microsoft people to find out what they changed (and broken) internally. It doesn't surprise me, though - Vista breaks a lot of stuff for existing applications. 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