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Solaris

TCP Problem

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Operating Systems Solaris TCP Problem
# 1  
Old 04-17-2008
TCP Problem
I am running a Java Client on Solaris 9 which communicates with the Server using TCP/IP.

The client transmits a FIN packet to server. The server sends a ACK, FIN enters LAST_ACK state and then waits for ACK from client. The client did not respond back leaving the server in LAST_ACK itself. Also the Client connects with the server on a fixed port, so the new connection attempt also results in a failure.

The point is, the client is written not to close the connection. I am not sure how and why the client sends a FIN. One more thing is the client is killed every day but this might not lead to this problem as ideally on killing, only a RST shud be sent to the server. The client is written on Java which will properly close the connection on exit.

My question is, Is der are any TCP/IP issue with the solaris stack which lead me to this problem? The server side is clean(even LAST_ACK sockets are teared down after 1000 seconds after which connection attempt is successful).
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LEARN ABOUT DEBIAN

net::smtp::server::client

Server::Client(3pm)					User Contributed Perl Documentation				       Server::Client(3pm)

NAME

       Net::SMTP::Server::Client - Client session handling for Net::SMTP::Server.

SYNOPSIS

	 use Carp;
	 use Net::SMTP::Server;
	 use Net::SMTP::Server::Client;
	 use Net::SMTP::Server::Relay;

	 $server = new Net::SMTP::Server('localhost', 25) ||
	   croak("Unable to handle client connection: $!
");

	 while($conn = $server->accept()) {
	   # We can perform all sorts of checks here for spammers, ACLs,
	   # and other useful stuff to check on a connection.

	   # Handle the client's connection and spawn off a new parser.
	   # This can/should be a fork() or a new thread,
	   # but for simplicity...
	   my $client = new Net::SMTP::Server::Client($conn) ||
	       croak("Unable to handle client connection: $!
");

	   # Process the client.  This command will block until
	   # the connecting client completes the SMTP transaction.
	   $client->process || next;

	   # In this simple server, we're just relaying everything
	   # to a server.  If a real server were implemented, you
	   # could save email to a file, or perform various other
	   # actions on it here.
	   my $relay = new Net::SMTP::Server::Relay($client->{FROM},
						    $client->{TO},
						    $client->{MSG});
	 }

DESCRIPTION

       The Net::SMTP::Server::Client module implements all the session handling required for a Net::SMTP::Server::Client connection.  The above
       example demonstrates how to use Net::SMTP::Server::Client with Net::SMTP::Server to handle SMTP connections.

       $client = new Net::SMTP::Server::Client($conn)

       Net::SMTP::Server::Client accepts one argument that must be a handle to a connection that will be used for communication.

       Once you have a new client session, simply call:

       $client->process

       This processes an SMTP transaction.  THIS MAY APPEAR TO HANG -- ESPECIALLY IF THERE IS A LARGE AMOUNT OF DATA BEING SENT.  Once this method
       returns, the server will have processed an entire SMTP transaction, and is ready to continue.

       Once $client->process returns, various fields have been filled in.  Those are:

	 $client->{TO}	  -- This is an array containing the intended
			     recipients for this message.  There may be
			     multiple recipients for any given message.

	 $client->{FROM}  -- This is the sender of the given message.
	 $client->{MSG}   -- The actual message data. :)

AUTHOR AND COPYRIGHT Net::SMTP::Server / SMTP::Server is Copyright(C) 1999, MacGyver (aka Habeeb J. Dihu) <macgyver@tos.net>.  ALL RIGHTS
       RESERVED.
       You may distribute this package under the terms of either the GNU General Public License or the Artistic License, as specified in the Perl
       README file.

SEE ALSO

       Net::SMTP::Server::Server, Net::SMTP::Server::Relay

perl v5.10.1							    1999-12-28						       Server::Client(3pm)