LISTNING is the state a server (listner) normally should be in, or do I miss something here? That you can replicate it on anotehr machines, does not say that very much. It can still be 1) the network, 2) wrong handling of sockets in the program, 3) something else. I guess I need to have a closer look at your first mail again to better understadn the problem, but right now I am bit sleepy so that will have to wait until tomorrow. -----Original Message----- From: Sherry To: php-windows@xxxxxxxxxxxxx Sent: 10-5-2004 19:44 Subject: Re: How to check port conection? socket_connect and fsockopen have problems BAT, I have tried fsockopen and socket_connect on two machines. First comp has Kerio firewall, and second hasn't any firewall. Problem persists on each machine. And I can't look at remote socket... Comp on other end just doesn't exist...:) After timeout (when using fsockopen) SYNC_SENT connection closes normally, but LISTENING connection remains. Best regards, Sherry. "B.A.T. Svensson" <B.A.T.Svensson@xxxxxxx> OIIAYEI/OIIAYEIA ? II?IOONE OIAAOAYAA: news:D291F33C586C8E48B95C26F8C805513A01A3DA91@xxxxxxxxxxxxxxxx > Ok, I see the nature of the problem now. > > You probably get all these SYNC_SENT and TIME_WAIT because > the hand shake is not properly done between the machines. > > SYNC_SENT means that the local socket is trying to > established a connection. > > TIME_WAIT indicates that no shutdown is (yet) recived > from the other end. > > (This how is the classical SYNC-attack works, i.e. > open a port on the remote machine, and drop the > connection without picking up the SYNC_SENT pakages, > leaving the remote server port in TIME_WAIT - this way > one can "eat up" all ports on a remote machine.) > > In these cases it very useful to have a look at the socket > state at the remote peer to determine weather the sync > package was received or not. > > > Firewalls can sometimes screw up this kind of traffic, > and drop SYNC packages in both direction without no good > reason - the firewall log may complain that the package > "looks like" it was forged, but in fact it is just fine. -- PHP Windows Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php -- PHP Windows Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
