I even tested a similar program of Client Socket in C++ to connect to port 3306, but the exception "Could not bind to port." was caught after 5 or 6 sockets. So I am quite sure it's sth wrong with the OS (RedHat Linux). --- Joanne Wing Yan Lai <joannelai@xxxxxxxxx> wrote: > Hi, > > I have implemented a simple java application (J2SE 1.4.2) in which > contains a server and a client. > > The server side has a ServerSocket to listen to the client messages and > the client side has a for loop to create many socket to a specific port. > > When I run the client, the following stack trace was printed after 4 or > 5 > sockets are created successfully. > > java.net.ConnectException: Connection refused > at java.net.PlainSocketImpl.socketConnect(Native Method) > at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:305) > at > java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:171) > at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:158) > at java.net.Socket.connect(Socket.java:426) > at java.net.Socket.connect(Socket.java:376) > at java.net.Socket.<init>(Socket.java:291) > at java.net.Socket.<init>(Socket.java:119) > at Client.main(Client.java:12) > > I have tested this on both RedHat linux 7.2 and RHEL 3.0 AS and both > fail. > However I run on Windows XP, it runs without any error. > > I have increased the ServerSocket backlog parameter on the server side > to > a bigger number (default is 50) but it makes no difference. Besides, I > have modified /usr/include/linux/socket.h in which the constant > SOMAXCONN > is changed from 128 to 1024, but it doesn't help as well. > > It seems to be there's some controls or limitations in RedHat Linux > which > causes the program to throw exception when the clients connect faster > than > the server can accept. > > Any help is appreciated. > > > > > __________________________________________ > Yahoo! DSL ?Something to write home about. > Just $16.99/mo. or less. > dsl.yahoo.com > > -- > redhat-list mailing list > unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe > https://www.redhat.com/mailman/listinfo/redhat-list > __________________________________________ Yahoo! DSL ? Something to write home about. Just $16.99/mo. or less. dsl.yahoo.com -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
