I'm trying to test smtp connectivity to my postfix configuration and I can telnet to port 25 from the computer itself but cannot from the outside. I get a connection refused error message. What am I doing wrong? I believe my dns is setup correctly as it seems the telnet can hit the box so I'm fairly sure its not that.
View 14 RepliesIs it possible to restrict telnet connection from remote to my server(linux -centos5)?
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Ex : [root@localhost]# telnet 10.0.0.33 80
Trying 10.0.0.33...
[code]...
I am trying to open the telnet port on my system with port 4100 and for the same i have inserted the entries in iptables file using below command./sbin/iptables -A INPUT -s 132.186.208.83/24 -p tcp �-dport 4100 -j ACCEPT.
View 1 Replies View RelatedSent an email by using telnet on port 25 from the terminal. Telnet states my message was sent but I never got it. Is it on the hard disk somewhere. Is there a log file? Where did my email go? Did it go into the ehter? I opened port 25 on my firewall through gnome by selecting 25/smpt checkbox as a trusted service.
View 8 Replies View RelatedTor open port 23 for telnet. Is this normal ?
View 3 Replies View RelatedIn a remote machine port 25 is open its enabled in firewall also...but not able to connect through telnet..why ?
netstat -an | grep 25
Code:
tcp 0 0 0.0.0.0:44525 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN
[code]....
Code:
telnet 172.17.65.206 25
Trying 172.17.65.206...
telnet: connect to address 172.17.65.206: No route to host
I have been trying all day today to setup a sendmail SMTP server on our Red Hat 5.5 dev box. We have 2 network cards, 1 to the local network with a 192.168 prefix and an external card which goes out to the web through a BT leased line through a Cisco router.
First I followed one of the many helpful tutorials online to setup sendmail, installed all the required packages and made a couple of small config changes to allow the service to listen on all IP addresses rather than just the localhost 127.0.0.1.
The main change is in the /etc/mail/sendmail.mc file where I have changed the following line;
DAEMON_OPTIONS(`Port=smtp,Addr=x.x.x.x, Name=MTA')dnl
I have tried removing Addr completely, setting to either the local or external IP and then rebuilding the sendmail file using 'make -C /etc/mail' and then restarting using 'service sendmail restart'
The SMTP port has been added into the firewall and it is showing to be listening on IP 0.0.0.0:25 which I believe means it is listening on all IP's assigned to the machine, sendmail is also in listen mode and running correctly.
Finally I have changed the /etc/mail/access file to include the local IP range 192.168 and external IP range and rebuilt this into the /etc/mail/access.db file and then restarted sendmail.
Googling the error all the sites I have found talk about making sure the 'DAEMON_OPTIONS(`Port=smtp,Addr=x.x.x.x, Name=MTA')dnl' line is uncommented and not much else in terms of what else might be incorrect.
I am starting to run out of ideas on things to change or check, telnet works correctly on other ports on the same server, ie httpd for apache on port 80. I have also rebooted the server to make sure that it wasn't something odd happening.
A netmap scan of my WAN IP address (cable modem) shows;
23/tcp open telnet?
8080/tcp open tcpwrapped
I've called Linksys and Netgear and they have said there is no user adjustable configuration allowed for the Cable Modems.
How am I supposed to close the open ports if the manufacturer doesn't allow access ?
I have a customer who is complaining that they can connect to prt y on IP x with telnet. They are seeing the following:
telnet x.x.x.x y
Trying x.x.x.x...
Connected to x.x.x.x.
Escape character is '^]'.
after some time the connection of course times out. Connection closed by foreign host. There is no telnet service running on this port so they cannot do anything, but they are complaining tht the fact that telnet "connects" is a security risk. I am having difficulty explaining why they are able to connect with telnet. I know it has to do with the socket layer API in Linux but I am having difficulty explaining this sufficiently. I also can't just say "this is the way linux works" to them. I am looking through "UNIX Network Programming" by W.
I'm trying to capture incoming/outgoing phone call data. Both telnet and nc have allowed me to easily direct this data to a file for later processing, HOWEVER I can't seem to get either to work as a background process. I want to put the connection into a shell script and run from cron.
View 4 Replies View RelatedI can telnet (while on the actual machine) using
Quote:
telnet localhost 25
When I try and use the local machine's ip
Quote:
telnet 192.168.100.9 25
I get
Quote:
Trying 192.168.100.9...
telnet: Unable to connect to remote host: Connection refused
[Code].....
This last one is strange as I the IP looks odd.
What I am doing wrong, and how do I fix it. After much surfing many mosts say that telnet is not used anymore but I want to use it to test my smtp server.
I have opened/added the ports 1812 and 1813 (both tcp & udp) for radius server in the firewall.
when i use the command : telnet localhost 1812 , the connection says "refused", i get the following messages code...
I have the following setup and Im trying to forward all incoming connection on port 1194 on eth2 which is the external network to ip 192.168.10.100, but seems its not working.
Current config:
# Generated by iptables-save v1.3.8 on Sun Nov 16 00:00:54 2008
*nat
:PREROUTING ACCEPT [26751696:2175544875]
:POSTROUTING ACCEPT [339911:19096812]
[code]....
plus im adding the prerouting:
iptables -t nat -A PREROUTING -i eth2 -p tcp --dport 1194 -j DNAT --to-destination 192.168.10.100
This configuration doesnt work. I also I have tried:
iptables -D PREROUTING -t nat -p tcp -d XX.XX.XX.XX --dport 1194 -m state --state NEW,ESTABLISHED,RELATED -j DNAT --to 192.168.10.100:1194
and the same its not working. Connecting thru telnet to the domain: telnet mydomain.org 1194 doesnt work, but within the server, running telnet 192.168.10.100 1194 it works.
I have a mail server i need it to send message via port 587 not port 25, i make some changes to my postfix server which i use and it is already successed making a telnet to 587 port like it :
[Code]....
Ok, a bit of a backround. I am a recent Ubuntu user and made the switch to Fedora being utilized as a server. I am trying to move to a new MUD(text based D&D type game) codebaseI have gotten my code compiled and executed the startup script. The process shows in the ps ux list. As the game it set up it uses port 7500. As the script running I get a "Connection Refused" error when trying to telnet to port 7500. Upon using nmap, I show only my SSH port open (the only daemon I have installed currently) yet no port 7500 open.
I believe this to be an issue somewhere in Fedora as I've had no issue on Ubuntu with past MUD codebases.I have disabled the firewall within Fedora and still no luck. Please bare with me as I'm new to fedora's intricacies.Short Story for those that hate reading long winded posts: A port that should be open by acript known to work on other distro's doesn't seem to open the called port using Fedora
i write this script:
[Code].....
i make this script to become a service ( i test it from bash, and my script work good), my problem is when i telnet to my local host (127.0.0.1) via a personal port like 5555 telnet give this error: ")syntax error: invalid arithmetic operator (error token is ", i know this error is for echo $(($A+$B)) and i know that telnet can not calculate $A+$B and the error is for this
i want to open specific port using iptables i.e 3159 Whenever i tried to telnet it generates the following error
Code:
# telnet 172.16.4.100 3195
Trying 172.16.4.100...
telnet: connect to address 172.16.4.100: No route to host
telnet: Unable to connect to remote host: No route to host
but when I stopped iptables
Code:
# service iptables stop
Its working fine
i added the ports in iptables i.e.
Code:
#iptables -A INPUT -p tcp --dport 3195 -j ACCEPT
for safe side I also added telnet port
Code:
# iptables -A INPUT -p tcp --dport 23 -j ACCEPT
but result was same.... In short telnet works without iptables but with iptables it generates the error mentioned above
I've tried searching for this peculiar behavior, but couldn't find a solution that works for it - I have installed Redhat on my system and have a listener running on port 7878. I wanted to check if the port is accessible from a machine on the network, and so i telnet-ed from a remote machine and it worked. Now comes the weird problem - I used the same command (telnet xxx.xxx.xxx.xxx 7878) locally and it was able to telnet. However, if I try to connect using localhost, meaning, "telnet localhost 7878" or "telnet 127.0.0.1 7878", it gives me the following error:
Trying 127.0.0.1...
telnet: connect to address 127.0.0.1: Connection refused
telnet: Unable to connect to remote host: Connection refused
Here is my /etc/hosts entry:
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 localhost.localdomain localhost
::1 localhost6.localdomain6 localhost6
[Code]....
Not sure where the problem is. I expect telnet to connect irrespective of whether i use the IP address OR localhost when i use telnet locally.
I am trying to find the difference between the above two services. Both are under xinetd and can someone please explain the difference between them (is one more secure than the other one?)
View 1 Replies View RelatedI have a sendmail daemon running on Linux, I can telnet @ port 25 from local shell, however if I telnet from a remote system @ port 25, it doesn't work. There is no firewall in between.
View 3 Replies View RelatedI've configured postfix on my linux server. For the most part, I got everything working (IMAP, apache, etc) but for some reason, I can't get postfix to work remotely. Postfix works locally to send mail. E.g. when I telnet locally to port 25. However, when I try to telnet from outside, the connection closes almost immediately. I've looked at various configuration options and tuning enhancements but found nothing helpful. Here is my config:
Code:
main.cf:
#See /usr/share/postfix/main.cf.dist for a commented, more complete version
# Debian specific: Specifying a file name will cause the first
# line of that file to be used as the name. The Debian default
[code]....
VERY new to linux, erm but I have an issue that needs solving!I recently moved to university, where their network blocks sftp port 22, this means that I cannot connect to my FTP server which is running a version of linux.Now I've got this ftp server connected to a seedbox and it was created using the following walk through..Code:I have written this guide for a friend, but I though it would be useful for others as well.
There are several guides floating around, but I found that most always cock up in some way. This one is tried and tested to work on Debian Etch (on an OVH rps, but should apply to most servers).If there is a new stable release of rtorrent/libtorrent then I will update this guide to show you how to update it (without reinstalling the whole server).
At the bottom there are also instructions to install ftp access & some network monitoring software.Basically, I would really like someone to be able to construct the commands on how to change the listen port for sftp connection on linux or add another port to the list that Linux would use so that I could put in through putty.
I just setup a server using Ubuntu 10.04LTS Desktop edition. I am a novice in these things. I was able to setup the SSH server and it works from outside my LAN quite well. I can telnet to it also with 22. I have then setup an email server. I can do telnet to it from the server itself but from the internet it just times out.
I did netstat -nlp and it shows that it is listening to port 25. I have port forwarding for 25 enabled on the router. I cleaned up all the rules of iptables and iptables -L shows everything is accepted.
If I forward port 80 to port 3128 for squid with an iptable rule, does port 3128 have to be open on the firewall or is this all routed behind the firewall?
View 4 Replies View Relatedserver: LAMP - debian, apache2, mysql, php5. a bit info on my network: There is a another service here that already uses port 443 already. It made my website time out, hence the move to another port. PLus, i dont want the 2 services sharing the port. What I am trying to do is forward 443 requests to another port where the SSL service is running so I can hide my port number in the URL.
Here is my sites available conf file:
Code:
NameVirtualHost *:80
NameVirtualHost *:443
NameVirtualHost *:####
[code]....
How to create a telnet server in ubuntu..?My students have unix Lab by next sem and so i would like to create telnet server so that they can access it from windows..
View 3 Replies View RelatedI would like to make a telnet connection to one server. I can't do this at first beceause i necesary to connect to another server. I use the program putty and this is the command to connect to my first machine:
[Code]....
how i will write my own telnet server instead of existing one.please give me the path for telnet.c file in the linux kernel
View 9 Replies View RelatedI am able to telnet localhost 143 and telnet ip 143 on localhost.but from outside network am not able to telnet ip 143.
View 2 Replies View RelatedI edited "sshd_config" file and changed port 22 to a new port. After I restart ssh, it listens on port 22 and the new port. How can I disable SSH to listen on port 22? I'm using Debian.
View 6 Replies View Related