05-12-2008
TCP wrappers uses the /etc/hosts.deny file to control access. It will produce something in the system log when a connection was blocked.
It doesn't just go activate itself so I'd bet more on the random DHCP fluff theory.
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Good day to you all,
Hope you must doing good..me..oh no I am not..I've trying to log on to my network from home...but it's not letting me...I am trying to use telnet cis.hfcc.net but it's saying "connection to the host cannot to be established"????what is this...any good reason...do I have to... (2 Replies)
Discussion started by: tahaislam
2 Replies
2. Filesystems, Disks and Memory
Hello friends,
The problem is that we have one SunOS5.7 server, while attempting telnet to that server following error is occured -
ld.so.1: login: fatal: libc.so.1: open failed: Too many open files
The login on console is possible. The inetd daemon is running. inetd.conf and services... (1 Reply)
Discussion started by: rahul72
1 Replies
3. IP Networking
Hello friends,
The problem is that we have one SunOS5.7 server, while attempting telnet to that server following error is occured -
ld.so.1: login: fatal: libc.so.1: open failed: Too many open files
The login on console is possible. The inetd daemon is running. inetd.conf and services... (3 Replies)
Discussion started by: rahul72
3 Replies
4. HP-UX
Hi,
My network layout is:
Pub LAN
|
freeBSD
|
Internal LAN
|
+ telnet srv on HP-UX 10.x box
+ other services (http, pop3, smtp, ftp)...
I've the following problem:
Inside Internal LAN I can connect myself to HP-UX telnet but from Public LAN in some place is refusing me... (5 Replies)
Discussion started by: efrenba
5 Replies
5. AIX
hi all,
i have a problem in telnet.when i am using telnet to my new aix server it takes about 5min to open.
can any one tell what i have to do.???? (5 Replies)
Discussion started by: rrlog
5 Replies
6. Solaris
Dear All
I have a Sun280R server when i telnet to this server from my Laptop i got error :
Could connect to 192.168.199.10(Server IP):port 23 closed
I want to login to the server through its Db25 serial port but i used to connect to it from my laptop through USB to db9 then to Db25 so do... (1 Reply)
Discussion started by: zanetti321
1 Replies
7. UNIX for Dummies Questions & Answers
Hello everyone,
I have got this following script to telnet to other UNIX boxes from one UNIX box and then run a script to count a certain paramater. The following line connects to the other box(es):
(sleep 1; echo $username; sleep 1; echo $password ; sleep 1 ; echo y; sleep 1; echo "\r" ; sleep 1... (2 Replies)
Discussion started by: Rajat
2 Replies
8. Shell Programming and Scripting
Somewhat long story:
I have a simple Perl CGI script that uses Expect to Telnet to a device and grab some data, and then spits it back to Perl for display on the Webpage.
This works for many devices I've tried, but one device just fails, it keeps rejecting the password on this device, only... (1 Reply)
Discussion started by: jondo
1 Replies
9. Shell Programming and Scripting
#!/usr/bin/perl
use strict;
use warnings;
use Net::Telnet ();
my $t = new Net::Telnet (Timeout => 10,
Prompt => '/.*(#|>|\))\s*$/');
my $remote_host='home';
$t->open(Host => $remote_host, Port =>23);
$t->login('root', 'pass');
the error that I get... (4 Replies)
Discussion started by: lassimanji
4 Replies
10. Linux
ok, i need to test a list of addresses via telnet and make sure that i get a response like the following:
telnet anag.testboalo.com443
Trying 100.100.100.100...
Connected to anag.testboalo.com.
Escape character is '^]'.
The thing is, for each address I telnet to, the telnet hangs in... (4 Replies)
Discussion started by: SkySmart
4 Replies
LEARN ABOUT LINUX
tcpdchk
TCPDCHK(8) System Manager's Manual TCPDCHK(8)
NAME
tcpdchk - tcp wrapper configuration checker
SYNOPSIS
tcpdchk [-a] [-d] [-i inet_conf] [-v]
DESCRIPTION
tcpdchk examines your tcp wrapper configuration and reports all potential and real problems it can find. The program examines the tcpd
access control files (by default, these are /etc/hosts.allow and /etc/hosts.deny), and compares the entries in these files against entries
in the inetd network configuration file.
tcpdchk reports problems such as non-existent pathnames; services that appear in tcpd access control rules, but are not controlled by tcpd;
services that should not be wrapped; non-existent host names or non-internet address forms; occurrences of host aliases instead of official
host names; hosts with a name/address conflict; inappropriate use of wildcard patterns; inappropriate use of NIS netgroups or references to
non-existent NIS netgroups; references to non-existent options; invalid arguments to options; and so on.
Where possible, tcpdchk provides a helpful suggestion to fix the problem.
OPTIONS
-a Report access control rules that permit access without an explicit ALLOW keyword.
-d Examine hosts.allow and hosts.deny files in the current directory instead of the default ones.
-i inet_conf
Specify this option when tcpdchk is unable to find your inetd.conf network configuration file, or when you suspect that the program
uses the wrong one.
-v Display the contents of each access control rule. Daemon lists, client lists, shell commands and options are shown in a pretty-
printed format; this makes it easier for you to spot any discrepancies between what you want and what the program understands.
FILES
The default locations of the tcpd access control tables are:
/etc/hosts.allow
/etc/hosts.deny
SEE ALSO
tcpdmatch(8), explain what tcpd would do in specific cases.
hosts_access(5), format of the tcpd access control tables.
hosts_options(5), format of the language extensions.
inetd.conf(5), format of the inetd control file.
AUTHORS
Wietse Venema (wietse@wzv.win.tue.nl),
Department of Mathematics and Computing Science,
Eindhoven University of Technology
Den Dolech 2, P.O. Box 513,
5600 MB Eindhoven, The Netherlands
TCPDCHK(8)