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 FREEBSD

tcpdrop

TCPDROP(8)						    BSD System Manager's Manual 						TCPDROP(8)

NAME

     tcpdrop -- drop TCP connections

SYNOPSIS

     tcpdrop local-address local-port foreign-address foreign-port
     tcpdrop [-l] -a

DESCRIPTION

     The tcpdrop command may be used to drop TCP connections from the command line.

     If -a is specified then tcpdrop will attempt to drop all active connections.  The -l flag may be given to list the tcpdrop invocation to drop
     all active connections one at a time.

     If -a is not specified then only the connection between the given local address local-address, port local-port, and the foreign address
     foreign-address, port foreign-port, will be dropped.

     Addresses and ports may be specified by name or numeric value.  Both IPv4 and IPv6 address formats are supported.

     The addresses and ports may be separated by periods or colons instead of spaces.

EXIT STATUS

     The tcpdrop utility exits 0 on success, and >0 if an error occurs.

EXAMPLES

     If a connection to httpd(8) is causing congestion on a network link, one can drop the TCP session in charge:

	   # sockstat -c | grep httpd
	   www	    httpd      16525 3	tcp4 
		   192.168.5.41:80	192.168.5.1:26747

     The following command will drop the connection:

	   # tcpdrop 192.168.5.41 80 192.168.5.1 26747

     The following command will drop all connections but those to or from port 22, the port used by sshd(8):

	   # tcpdrop -l -a | grep -vw 22 | sh

SEE ALSO

     netstat(1), sockstat(1)

AUTHORS

     Markus Friedl <markus@openbsd.org>
     Juli Mallett <jmallett@FreeBSD.org>

BSD
								 January 30, 2013							       BSD

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