01-17-2012
Kernel thinks tcp port in use but isnt
I have a RHEL 5.5 system that i see this behavior on:
# uname -a
Linux myhost 2.6.18-194.17.4.0.1.el5 #1 SMP Tue Oct 26 20:10:33 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux
#using netcat to listen to a port tells me its in use.
$ nc -l myhostip 33371
nc: Address already in use
$
# trying to telnet to the port
$ telnet myhostip 33371
Trying myhostip...
telnet: connect to address myhostip: Connection refused
telnet: Unable to connect to remote host: Connection refused
# lsof doesn't agree. returns nothing
$ lsof | grep 33371
$
# another option to lsof thats supposed to find sockets. returns nothing.
$ lsof -i :33371
$
# netstat -an doesn't show the port listening or in time_wait or in close_wait state.
$ netstat -an | grep 33371
$
Anyone have any idea on how to figure out what is using that port? I don't want to just reboot to fix.
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LEARN ABOUT OSF1
telnetrc
telnetrc(4) Kernel Interfaces Manual telnetrc(4)
NAME
telnetrc, .telnetrc - Specifies setup commands for a telnet session
SYNOPSIS
$HOME/.telnetrc
DESCRIPTION
The .telnetrc file contains the setup information for a telnet session. It is a hidden file in your home directory and must be readable by
the user logging in.
The file can consist of multiple entries for each remote host to which a user can connect. A remote host entry consists of multiple lines.
The first line is the name of a remote host. The subsequent lines must begin with blank spaces, and contain telnet subcommands. These sub-
commands are processed as though they were typed in manually. Lines beginning with a number sign (#) are comment lines. See telnet(1) for
a complete list of telnet subcommands.
To specify subcommands that apply to all systems, create an entry, using the word "DEFAULT" as the system name, and specify the telnet sub-
commands in the subsequent lines.
EXAMPLES
The following shows a sample .telnetrc file:
# Beginning of telnetrc file # Default subcommands that apply to all systems DEFAULT
environ undefine USER # First system entry system1
set echo
toggle crlf # Second system entry system2
set echo
mode line
toggle crlf
FILES
User-customized telnet startup values.
RELATED INFORMATION
Commands: telnet(1). delim off
telnetrc(4)