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Operating Systems AIX Process running but not listening Post 302704633 by abohmeed on Saturday 22nd of September 2012 03:24:46 PM
Old 09-22-2012
Process running but not listening

Hello guys
I am experiencing a very strange behavior on one of our AIX servers. We have an application with several processes that listen on several port numbers. Sometimes we receive complains that people cannot connect to the server on a specific port that is used by one the application processes. When we check for the process status we can see that the process is up and running and everything is ok. But when we run
Code:
netstat -an | grep 1234

where 1234 is (for example) the port number, we don't find the port in the list of the listening ports.
The obvious solution is to kill and restart the process. Well this doesn't always solve the problem as sometimes it stays that way even after restarting it and stays for a few minutes before listening.
Now the question is: what could possibly cause an application in AIX to be running but not listening on the port where it should be listening?
Does the existence of too many concurrent connections to the same port cause this behavior?
Thanks a lot in advance and I appreciate any help from your side.

Regards
 

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efax-gtk-socket-client(1)				      General Commands Manual					 efax-gtk-socket-client(1)

NAME
efax-gtk-socket-client - a client of efax-gtk to work with lpd/lprng SYNOPSIS
efax-gtk-socket-client [hostname] [port] DESCRIPTION
This program enables lpd/lprng to access the efax-gtk socket server. Meaning the user can send faxes to a printer, which will ack as a fax. It takes two arguments - first a hostname to connect to, and secondly a port number at that hostname to connect to. All efax-gtk-socket- client does is to read from standard input (in this case from lpd/lprng) and passes it to a socket at the hostname and port number passed as arguments to it (namely the hostname of the computer efax-gtk is running on - normally you would specify localhost - and the port number of the socket). fax: :sd=/var/spool/fax: :mx#0: :sh: :lp=/dev/null: :if=/var/spool/fax/efax-gtk-faxfilter: This will cause a printer by the name of "fax" to be available, which (if printed to) will send the file to the efax-gtk socket server. If you set efax-gtk to listen on a port other than port 9900, you will need to amend the file /var/spool/fax/efax-gtk-faxfilter by hand to specify the correct port number on which efax-gtk is listening. Don't forget to restart the lpd printer daemon after amending /etc/printcap. OPTIONS
[ hostname ] - The name of the host to listen to. Usually should be locahlhost. [ port ] - the port number to listen to on the [ hostname ]. SEE ALSO
efax(1), efax-gtk(1). AUTHOR
efax-gtk-socket-client was written by Chris Vine <chris@cvine.freeserve.co.uk>. This manual page was written by Lior Kaplan <kaplan@debian.org>, for the Debian project (but may be used by others). July 18, 2006 efax-gtk-socket-client(1)
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