Is my Socket Free or Listening Post: 302971981

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Top Forums Shell Programming and Scripting Is my Socket Free or Listening Post 302971981 by mohtashims on Wednesday 27th of April 2016 06:02:49 PM

04-27-2016

Registered User

Is my Socket Free or Listening

Hi,

Code:

bash-3.2$ uname -a
Linux mymac 2.6.18-409.el5 #1 SMP Fri Feb 12 06:37:28 EST 2016 x86_64 x86_64 x86_64 GNU/Linux

bash-3.2$ telnet 10.12.228.40 13900
Trying 10.12.228.40...
telnet: connect to address 10.12.228.40: Connection refused
bash-3.2$ telnet 10.12.228.40 23900
Trying 10.12.228.40...
Connected to 10.12.228.40.
Escape character is '^]'.
Connection closed by foreign host.

bash-3.2$ telnet 10.12.228.40 24000
Trying 10.12.228.40...
telnet: connect to address 10.12.228.40: Connection refused

This makes me believe 10.12.228.40 24000 is free for use.

But when i start a process on that socket 10.12.228.40 24000 it fails saying

Code:

The address 10.12.228.40 might be incorrect or another process is using port 24000: java.net.BindException: Cannot assign requested address

Please explain.

Last edited by Corona688; 04-27-2016 at 07:14 PM..

mohtashims

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LEARN ABOUT DEBIAN

in.identtestd

IN.IDENTTESTD(8)						 Library functions						  IN.IDENTTESTD(8)

NAME

       in.identtestd - a small daemon that can be used to test Ident servers

SYNOPSIS

       in.identtestd

DESCRIPTION

       in.identtestd  is  a  small daemon (to be started from inetd) that does an ident lookup on you if you telnet into it. Can be used to verify
       that your Ident server is working correctly.

       The source code can be found in the debian libident source package, as ident-tester.c.

EXAMPLE

       A typical entry in /etc/inetd.conf would be:

       9999 stream tcp nowait root /usr/sbin/in.identtestd in.identtestd

       With the above entry in place and active, execute "telnet hostname 9999" from either this system, or another system. It should  show  some-
       thing like:

	   Trying hostname...
	   Connected to hostname.
	   Escape character is '^]'.
	   Welcome to the IDENT server tester, version 1.9

	   (Linked with libident 0.22 Debian)

	   Connecting to Ident server at 192.168.1.1...
	   Querying for lport 1109, fport 9999....
	   Reading response data...
	   Userid response is:
	      Lport........ 1109
	      Fport........ 9999
	      Opsys........ UNIX
	      Charset...... <not specified>
	      Identifier... paul
	   Connection closed by foreign host.

AUTHOR

       Peter Eriksson <pen@lysator.liu.se>
       Manpage written for debian by Paul Slootman <paul@debian.org>.

SEE ALSO

       ident(3), identd(8), tcpd(8)

3rd Berkeley Distribution													  IN.IDENTTESTD(8)