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From "James Carman" <ja...@carmanconsulting.com>
Subject Re: The java.net.SocketException: No buffer space available (maximum connections reached?): listen failed Exception
Date Tue, 02 Sep 2008 16:40:20 GMT
Can we see your implementation of SocketFactory?

On Tue, Sep 2, 2008 at 9:01 AM, chitraa <achitraleka@gmail.com> wrote:
>
> Hi all,
>
> Although the subject of this message indicates that the Exception I am
> getting is a java thing, I am using the apache.commons.net package and have
> a suspicion that it could be related to this library.
>
> Here's a bit about my program. My program makes a TCPIP connection to other
> machines and uses the FTP protocol to retrieve files to download on the
> remote machine. I am using the apache.commons.net.FtpClient java class to
> provide me with an interface that allows me to connect to the remote
> machine, log on, list the files that are on the remote computer and download
> all the files that I need.
>
> I have written my own implementation for apache.commons.net.SocketFactory.
> Also, I have ensured that when I connect to a machine and open a socket, I
> disconnect when I am done with the connection.
>
> After 2 days, I get this exception:
>
> java.net.SocketException: No buffer space available (maximum connections
> reached?): listen failed
> at java.net.PlainSocketImpl.socketListen(Native Method)
> at java.net.PlainSocketImpl.listen(Unknown Source)
> at java.net.ServerSocket.bind(Unknown Source)
> at java.net.ServerSocket.<init>(Unknown Source)
> at
> com.mypackage.TimeoutSettingServerSocketProxy.<init>TimeoutSettingServerSocketProxy.java:28)
> at
> com.mypackage.MySocketFactory.createServerSocket(RedflexSocketFactory.java:69)
> at
> org.apache.commons.net.ftp.FTPClient._openDataConnection_(FTPClient.java:475)
> at org.apache.commons.net.ftp.FTPClient.retrieveFile(FTPClient.java:1285)
>
> After running a few test programs, I realised that this was because the
> server was having too many open connections. I have checked my program and I
> have closed all open sockets. So, I was wondering if there is an issue with
> apache.commons.net? Does FTPClient open up a ServerSocket without closing
> it?
>
> Also, whats interesting is that once this exception has been thrown, I get
> disconnected from the machine. Reconnecting to it will obviously throw the
> exception again. However, when I connect to other machines, it throws the
> same exception:
>
> Failed to connect to 192.168.1.2 No buffer space available (maximum
> connections reached?): connect
>
> If the 'no buffer space available' is thrown because of too many open
> connections on the server, why can't I connect to other servers (which don't
> have many open connections). Why does the client (my machine) throw that
> same exception when trying to connect to OTHER machines?
>
> Thank you.
> Kind regards,
> Chitra
> --
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>
>
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