Process running but not listening Post: 302704633

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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

09-22-2012

Registered User

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

abohmeed

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upscli_splitaddr

UPSCLI_SPLITADDR(3)						    NUT Manual						       UPSCLI_SPLITADDR(3)

NAME

       upscli_splitaddr - split a listening address into its components

SYNOPSIS

       #include <upsclient.h>

       int upscli_splitaddr(const char *buf, char **hostname,
				      int *port)

DESCRIPTION

       The upscli_splitaddr() function takes a pointer to the raw UPS definition buf and returns pointers to dynamically allocated memory in
       upsname and hostname. It also copies the port number into port.

FORMATTING

       A listening address definition is specified according to this format:

	   <hostname>[:<port>]

       Definitions without an explicit port value receive the default value of 3493.

MEMORY USAGE

       You must free(3) the pointer hostname when you are done with it to avoid memory leaks.

RETURN VALUE

       The upscli_splitaddr() function returns 0 on success, or -1 if an error occurs.

SEE ALSO

       upscli_fd(3), upscli_get(3), upscli_readline(3), upscli_sendline(3), upscli_splitname(3), upscli_ssl(3), upscli_strerror(3),
       upscli_upserror(3)

Network UPS Tools						    05/22/2012						       UPSCLI_SPLITADDR(3)

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upscli_splitaddr