03-14-2012
nc (netcat): Connection refused problem
From my machine (ubuntu), I can do
$ nc somemachine 80
But, when I want to connect to other machine that runs nc on different ports, it throws "Connection refused" error.
The same error occurs on my local machine. For example,
[term 1] nc -l 5555
[term 2] nc x.x.x.x 5555 --> this throws "Connection refused" error (x.x.x.x is the ip number of the local machine)
It works on my ubuntu virtual machine though. So, I wonder what makes to throw out "Connection refused" error on nc.
Firewall? Network configuration? Anything else?
How can I make it work? On the same machine or across the machine?
Many thanks in advance.
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EXINEXT(8) System Manager's Manual EXINEXT(8)
NAME
exinext - Finding individual retry times
SYNOPSIS
exinext address|message-id
DESCRIPTION
A utility called exinext (mostly a Perl script) provides the ability to fish specific information out of the retry database. Given a mail
domain (or a complete address), it looks up the hosts for that domain, and outputs any retry information for the hosts or for the domain.
At present, the retry information is obtained by running exim_dumpdb (see below) and processing the output. For example:
exinext piglet@milne.fict.example
kanga.milne.fict.example:192.168.8.1 error 146: Connection refused
first failed: 21-Feb-1996 14:57:34
last tried: 21-Feb-1996 14:57:34
next try at: 21-Feb-1996 15:02:34
roo.milne.fict.example:192.168.8.3 error 146: Connection refused
first failed: 20-Jan-1996 13:12:08
last tried: 21-Feb-1996 11:42:03
next try at: 21-Feb-1996 19:42:03
past final cutoff time
You can also give exinext a local part, without a domain, and it will give any retry information for that local part in your default
domain. A message id can be used to obtain retry information pertaining to a specific message. This exists only when an attempt to
deliver a message to a remote host suffers a message-specific error (see section 42.2). exinext is not particularly efficient, but then it
isn't expected to be run very often.
BUGS
This manual page needs a major re-work. If somebody knows better groff than us and has more experience in writing manual pages, any patches
would be greatly appreciated.
SEE ALSO
exim(8), /usr/share/doc/exim4-base/
AUTHOR
This manual page was stitched together from spec.txt by Andreas Metzler <ametzler at downhill.at.eu.org>, for the Debian GNU/Linux system
(but may be used by others).
March 26, 2003 EXINEXT(8)