I'm not clear on this. Do you mean a login failure? Or something else, like a network issue? What happens is specific to the error, but your question is so general I have no clue what you want.
Actually I think I was pretty clear
I am on machineA. I launch this command :
Afterwards I go on machineB. Will I be able to find any trace of this telnet attempt? If so, where ?
---------- Post updated at 07:29 AM ---------- Previous update was at 07:25 AM ----------
As a side note:
There's no communication problem between these 2 machines. I can have a succesfully telnet command from machineA to machineB on a different port. I can also ssh between these 2 machines. My only problem is when the respective process on machineB does not listen on port 80. When that happens (and I detect that woth a telnet from machineA) will I be able to find the trace of that telnet attempt on the destination machine (machineB) ?
PPS:
I do not want to find out why the telnet command fails. I only want to know how/where can I trace these failed telnet attempts on the destination machine (machineB).
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regexp::common::uri::telnet
Regexp::Common::URI::telnet(3) User Contributed Perl Documentation Regexp::Common::URI::telnet(3)NAME
Regexp::Common::URI::telnet -- Returns a pattern for telnet URIs.
SYNOPSIS
use Regexp::Common qw /URI/;
while (<>) {
/$RE{URI}{telnet}/ and print "Contains a telnet URI.
";
}
DESCRIPTION
$RE{URI}{telnet}
Returns a pattern that matches telnet URIs, as defined by RFC 1738. Telnet URIs have the form:
"telnet:" "//" [ user [ ":" password ] "@" ] host [ ":" port ] [ "/" ]
Under "{-keep}", the following are returned:
$1 The complete URI.
$2 The scheme.
$3 The username:password combo, or just the username if there is no password.
$4 The username, if given.
$5 The password, if given.
$6 The host:port combo, or just the host if there's no port.
$7 The host.
$8 The port, if given.
$9 The trailing slash, if any.
REFERENCES
[RFC 1738]
Berners-Lee, Tim, Masinter, L., McCahill, M.: Uniform Resource Locators (URL). December 1994.
SEE ALSO
Regexp::Common::URI for other supported URIs.
AUTHOR
Damian Conway (damian@conway.org)
MAINTAINANCE
This package is maintained by Abigail (regexp-common@abigail.be).
BUGS AND IRRITATIONS
Bound to be plenty.
LICENSE and COPYRIGHT
This software is Copyright (c) 2001 - 2009, Damian Conway and Abigail.
This module is free software, and maybe used under any of the following licenses:
1) The Perl Artistic License. See the file COPYRIGHT.AL.
2) The Perl Artistic License 2.0. See the file COPYRIGHT.AL2.
3) The BSD Licence. See the file COPYRIGHT.BSD.
4) The MIT Licence. See the file COPYRIGHT.MIT.
perl v5.16.2 2010-02-23 Regexp::Common::URI::telnet(3)