Port hang issue in AIX Version 5.3 Post: 302343151

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Operating Systems AIX Port hang issue in AIX Version 5.3 Post 302343151 by subharai on Tuesday 11th of August 2009 08:39:17 PM

08-11-2009

Registered User

Port hang issue in AIX Version 5.3

On AIX platform we are having Weblogic 8.1 as the middleware for an application.

The application is deployed in Weblogic on AIX platform and the server is having 2 dedicated listening ports for any incoming requests.

Output for netstat -an command for the port 30001 is as follows:-

tcp4 0 0 X.X.X.X.30001 Z.Z.Z.Z.20501 ESTABLISHED
tcp4 0 0 X.X.X.X.30001 Z.Z.Z.Z.47428 ESTABLISHED
tcp4 0 0 X.X.X.X.30001 Z.Z.Z.Z.48077 ESTABLISHED
tcp 0 0 *.30001 *.* LISTEN
tcp4 0 0 X.X.X.X.30001 Z.Z.Z.Z.52664 ESTABLISHED
tcp4 0 0 X.X.X.X.30001 Z.Z.Z.Z.53170 ESTABLISHED
tcp4 0 0 X.X.X.X.30001 Y.Y.Y.Y.55643 ESTABLISHED
tcp4 0 0 X.X.X.X.30001 Y.Y.Y.Y.55667 ESTABLISHED
tcp4 0 0 X.X.X.X.30001 Y.Y.Y.Y.55668 ESTABLISHED
tcp4 0 0 X.X.X.X.30001 Y.Y.Y.Y.55669 ESTABLISHED
tcp4 0 0 X.X.X.X.30001 Y.Y.Y.Y.55680 ESTABLISHED
tcp4 0 0 X.X.X.X.30001 Y.Y.Y.Y.55691 ESTABLISHED
tcp4 0 0 X.X.X.X.30001 Y.Y.Y.Y.55694 ESTABLISHED
tcp4 0 0 X.X.X.X.30001 Y.Y.Y.Y.55703 ESTABLISHED
tcp4 0 0 X.X.X.X.30001 Y.Y.Y.Y.55719 ESTABLISHED
tcp4 0 0 X.X.X.X.30001 Y.Y.Y.Y.55753 ESTABLISHED
tcp4 0 0 X.X.X.X.30001 Y.Y.Y.Y.55755 ESTABLISHED
tcp4 0 0 X.X.X.X.30001 Y.Y.Y.Y.55758 ESTABLISHED
tcp4 0 0 X.X.X.X.30001 Y.Y.Y.Y.55761 ESTABLISHED
tcp4 0 0 X.X.X.X.30001 Y.Y.Y.Y.55762 ESTABLISHED
tcp4 0 0 X.X.X.X.30001 Y.Y.Y.Y.55781 ESTABLISHED
tcp4 0 0 X.X.X.X.30001 Z.Z.Z.Z.54436 ESTABLISHED
tcp4 0 0 X.X.X.X.30001 Z.Z.Z.Z.54891 ESTABLISHED
tcp4 0 0 X.X.X.X.30001 Z.Z.Z.Z.55333 ESTABLISHED
tcp4 0 0 X.X.X.X.30001 Z.Z.Z.Z.31796 ESTABLISHED
tcp4 0 0 X.X.X.X.30001 Z.Z.Z.Z.31979 ESTABLISHED
tcp4 0 0 X.X.X.X.30001 Z.Z.Z.Z.32428 ESTABLISHED
tcp4 0 0 X.X.X.X.30001 Z.Z.Z.Z.59195 ESTABLISHED
tcp4 0 0 X.X.X.X.30001 Z.Z.Z.Z.59314 ESTABLISHED
tcp4 0 0 X.X.X.X.30001 Z.Z.Z.Z.10405 ESTABLISHED
tcp4 0 0 X.X.X.X.30001 Z.Z.Z.Z.59457 ESTABLISHED
tcp4 0 0 X.X.X.X.30001 Z.Z.Z.Z.12872 ESTABLISHED
tcp4 0 0 X.X.X.X.30001 Z.Z.Z.Z.12943 ESTABLISHED
tcp4 0 0 X.X.X.X.30001 Z.Z.Z.Z.39168 ESTABLISHED
tcp4 0 0 X.X.X.X.30001 Z.Z.Z.Z.42803 ESTABLISHED

With time the no. of established connection get increased and as soon as the count reaches more than 300 the port gets hanged.

The only workaround as of now available to us is to bounce the application server to bring up the ports in listening status.

FYI, the ip's Y.Y.Y.Y and Z.Z.Z.Z can be connected through telnet.

Please suggest how to release these established ports without restarting the application.

Let me know if you require any further information.

Thank U in advance.

subharai

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LEARN ABOUT DEBIAN

qpsmtpd-prefork

qpsmtpd-prefork(8)					      System Manager's Manual						qpsmtpd-prefork(8)

NAME

       qpsmtpd-prefork - Preforkin server for qpsmtpd

SYNOPSIS

       qpsmtpd-prefork [options]

DESCRIPTION

       qpsmtpd-prefork	is the qpsmtpd frontend script which binds to the SMTP TCP socket, and asynchronously forks new children in advance of new
       connections.

OPTIONS

       --port port
	      Binds to a specific port, instead of the default 2525.

       --user user
	      On startup, switch to run as user instead of the starting user.  Applies only when started as root (as is normal when  listening	on
	      port 25).

       --limit-connections limit
	      Accept at most limit simultaneous connections.  Inbound connections beyondthis limit will be deferred or refused.

       --max-from-ip limit
	      Accept at most limit simultaneous connections from any given IP address; does not override --limit-connections, if set.

       --children limit
	      Limit the total number of child processes to limit; once all children are handling requests, further connections are deferred.

       --idle-children count

	      Keep count child processes available, subject to the upper bound given via --children.  Specify 0 to disable preforking entirely.

       --interface addr
	      Bind  to	the  local address addr, instead of the default behavior of binding to all interfaces.	Can be specified multiple times to
	      bind to more than one interface or local address.

       --renice-parent delta

	      Adjust the priority of the parent process by delta, yielding more CPU time to other processes.  The default is 5.

       --detach
	      Detach from the controlling terminal at startup, to run as a standalone daemon.  See also --pid-file.

       --pid-file filename
	      Upon startup, and after daemonizing if applicable, write the process ID to filename, for use by sysvinit control scripts or  similar
	      utilities.

       --pretty-child

	      Update child process names within the process table.

       --version
	      Print the qpsmtpd release version and exit.

       --debug
	      Be somewhat more verbose about logging during startup (has no effect once fully started).

       --help Display commandline help and exit.

AUTHOR

       Copyright (c) 2006, SoftScan; based on qpsmtpd-forkserver by Ask Bjorn Hansen <ask@develooper.com>

	http://smtpd.develooper.com/

																qpsmtpd-prefork(8)

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