Telnet is a protocol for bidirectional interactive text-oriented communication with remote hosts via virtual terminals. It is defined in [RFC 854](http://tools.ietf.org/html/rfc854). Telnet provides no inherent security and so is becoming less commonly supported. On modern UNIX-like systems it ...

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What might be causing telnet not to work from the mail server?

We are having and issue with sending some emails to domains outside of our network. We fixed a reverse dns issue and it did not resolve all of the issues. We then realized that we could not connect ...
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1answer
93 views

Telnet: Unable to connect to remote host

Related Threads: SMTP server works, but telnet to port 25 does not Can't connect to SMTP server The problem I have a server running Debian 3.2.65-1 and i am having some problems to connect other ...
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2answers
363 views

How to connect more than one telnet session to Cisco router ( Port Com10 )?

I am working on connecting more than one telnet session to Cisco Router. I was unsuccessful till now and decided to post it for getting any valuable directions and info. Thanks
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2answers
2k views

Cannot telnet to port 25

When I try to telnet to port 25 using this command: telnet aspmx.l.google.com 25 I get this message Trying 173.194.69.26... And nothing more happens. I disabled csf but the problem still ...
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1answer
639 views

How to enable telnet with port 3306 during Master to master replication on MySQL Server

I am trying to do Master to Master Replication in Windows Server 2008. I am successfully able to replicate all the database of Master 1 to Master 2. But I am unable to replicate the changes made on ...
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2answers
2k views

I cannot telnet www.google.com 80 on my centos, why?

On my centos I have a problem. I cannot: [root@server]# telnet www.google.com 80 telnet: www.google.com: Name or service not known www.google.com: Unknown server error [root@server]# However I ...
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2answers
6k views

CentOS open port 7000 [RESOLVED]

I have two boxes one ubuntu v10.10 (IP: 192.168.12.128) and another centos v5.5 (IP: 192.168.12.131) I m able to ping centos from ubuntu box and vice versa. When I telnet UBUNTUIP using port 7000 ...
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2answers
2k views

Exchange server 2003 not sending messages sent to internal addresses via telnet?

For a variety of reasons, I am needing to programmatically send mail through an Exchange 2003 server. I'm not able to use any built-in "SmtpClient" classes so I'm following the SMTP protocol over ...
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1answer
919 views

Different behaviour of netcat from telnet when connecting to public route server

I have observed a different behaviour between netcat and telnet when connecting to the public route server bgp-view.tvnetwork.hu and issuing the command show ip bgp. Using Telnet the output (which is ...
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3answers
233 views

remote telnet and email

This issue has been occupying my work for the last few days and I will be understating when I say its driven me up the blasted walls. Essentially, I can ping and tracert the domain jnrcs.org and the ...
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3answers
2k views

Override screen size in linux telnet

Here's my predicament. I'm developing a perl telnet script that uses Expect to spawn a new telnet process and feed data (non-interactively) into it. Everything works fine when I call the script from ...
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1answer
45 views

Centos 7 network issue

I have a Centos 7 server behind a Dell sonicwall I have configured the sonicwall to allow certain services and this seems to work fine. However I can't telnet to some ports. I have added Wireshark to ...
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1answer
68 views

Firewall configured to allow 25/tcp but still cannot telnet into server on that port [duplicate]

I've got postfix and dovecot running on ports 25, 110, 587, 465, 993, 995 for the usual mail protocols. I can telnet into all ports except port 25 which you can see below. Any ideas on what's going on?...
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1answer
1k views

Azure VM ping and telnet not working

I have an azure VM (resource manager) on the new portal running windows server 2012 r2 with HPC with a public IP, Currently i can login to the VM using a remote desktop client but i cannot ping myself ...
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1answer
52 views

Telnet, Startech, and a Transmitter

I'm at a bit of a loss and will also preface by saying that I have very little experience working with Telnet. I have Startech Serial over IP 'webserver' setup, everything seems fine on this end. Next ...
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1answer
706 views

postfix - connection refused from behind NAT

When attempting to telnet postfix from a different host in the same LAN through the FQDN (and thus the LAN's public IP), the following error occurs: root@mailer:/var/log# telnet mail.domain.com 25 ...
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1answer
254 views

Redirect telnet “interactivity” from host 3 to host 1 through host 2 (proxy?)

My network configuration: host 1 [h1] - User machine connected via VPN to the main host (host 2). (Win 7) host 2 [h2] - The gate through other machines of my network. No firewall, no ip rules. (Win ...
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1answer
1k views

Telnet to new SMTP server port 25 times out

I just got Postfix 2.9.6 up and running on a Debian 7 Wheezy server and I can send and receive mail to the outside world but I'm unable to login to the SMTP server. I've tried telnet, first by ...
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2answers
9k views

unable to connect through telnet in windows 7 [closed]

I'm trying to connect to my computer through telnet. I've turned telnet client and server on. I've opened port 23 on my computer firewall and on my router. But when i test it: C:\>telnet 192.168....
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1answer
162 views

Is server being compromised? I've seen a client telnet session at logon

I've seen open a new window with a client telnet sesion at login this morning at SBS 2011 server. The window displayed some random chars (non alphanumerics) a few seconds and gone. The server is fully ...
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2answers
4k views

Connection refused when doing telnet to windows machine

I am doing telnet to windows host from Linux to list Check_mk_agent data. but its giving me following output. [root@myhost ~]# telnet winhost 6556 Trying xxx.xx.xx.x... telnet: connect to address xxx....
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1answer
2k views

Telnet doesn't accept Enter as a newline [closed]

I am just trying some really basic Telnet as part of a HTTP tutorial, but everything I've read assumes that the Enter key works very differently than how it's been working for me so far. So an ...
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1answer
4k views

Some machines in my network can't access a specific website

Something pretty bizarre is happening here. I'm try to access a website from some machines inside my network and I just can't, while other machines access it normally. The website is online.sefaz.am....
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1answer
1k views

Issue with setting up Telnet Management on Open VPN Server

When I enable telnet on openVPN (windows) using this parameter management localhost 25333, I am not able to access the clients through their virtual IPs anymore. At the same time, when I disable this ...
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1answer
382 views

Monitoring memcached with plink

I need a telnet client that can take commands from a file or stdin so I can do some quick-and-dirty automatic monitoring of memcached. I thought plink would be good for this, but it seems to be doing ...
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1answer
132 views

Forward local port to remote host telnet port

I'm trying to forward a local port to a remote telnet host. Something like this. MyHost -----> |2222 Proxy |------> |23 Destination | MyHost: I'm on a Windows PC. Proxy: Is a linux box which I ...
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2answers
1k views

Connections to host are sporadically successful with mysql_connect() and telnet, but I can always ping the host successfully?

When I try to connect to a host on my LAN with mysql_connect();, the connections succeed some of the time and fail at other times. I can always ping the MySQL server successfully, but when I try to ...
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1answer
300 views

Change port from ipv6 address to ipv4 address

I have setup a service on my server which has opened a port (ie, 40000) but its foreign address is :::* which is a wildcard ipv6 address (I think) When I run telnet localhost 40000 on the server the ...
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1answer
1k views

Postfix SASL SMTP

I am getting an issue when trying to send out email on 465 secure SMTP with a Postfix + Courier with MySQL virtual users. I am able to connect with IMAP secure and download, and I can also send mail ...
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3answers
1k views

Configuring an SMTP server in order to activate a Blackberry device on BES without data plan

I have been trying to get Blackberry Entreprise Server 5.0 running on my Windows 2008 VM. It seems to work, I can now add users and find them into Active Directory. The next step for me would be to ...
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1answer
301 views

Dovecot immediately logs off user

I'm trying to set up email on my server, and have successfully set up POP3 with gmail for my main account. When attempting to set up another user though, gmail reports ` There was a problem ...
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2answers
989 views

Munin on localhost (telnet only displays period)

I set up munin to run as root for testing, my relevant config is as so: munin.conf: [localhost] address 127.0.0.1 use_node_name yes I tried fqnd.mysite.com (but it couldn't connect), ...
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1answer
347 views

Cannot telnet my computer

A service is running in my system (redhat linux) which opens the port 9000. When i do # telnet localhost 9000 it says, Trying 127.0.0.1... Connected to localhost.localdomain (127.0.0.1). Escape ...
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1answer
473 views

Telnet session - can't run commands

I have 2 VMs running CentOS 5.0 and I configured telnet on both of them. I can telnet from one to another... but when I type ls or cd at the prompt I get a message like this -bash: ls: command not ...
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2answers
3k views

Restore passwd for root on a server

      I have a DVR server with linux embeded. It has some telnet functions but i don't have the password for it (the chinese manufacturer refuses to give me the password). ...
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0answers
33 views

Difference in telnet of amazon ec2 instance using internal and public IP

I have a 4 node hadoop cluster on ec2. We have configured Hortonworks Hadoop (HDP version 2.4) through Ambari. I have opened all traffic for our all four instances internally and the office external ...
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2answers
36 views

Iptables seems to be blocking outgoing HTTP connections

We recently noticed that outgoing HTTP traffic seems be blocked. Specifically we need to allow HTTP requests to a give website URL. I'm not sure if this is possible as I believe typically it must be ...
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1answer
31 views

Windows Server 2012 Telnet connection lost port 25

I am new to Windows servers, I have Windows Server 2012 and I am trying to set up and enable mail server (SMTP). I have followed this tutorial to instal and enable SMTP server and completed it ...
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0answers
52 views

“No route to host” when i do a telnet in azure

I have two VM's in azure with different public IP's and whose private IP's are : 10.10.1.9 10.10.1.6 When i do a telnet with following command from the server 10.10.1.6, i get the a error: telnet ...
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votes
1answer
52 views

letsencrypt works www but not root domain (apache)

i'm trying to install letsencrypt on a server, both www and the root domains are hosted by the box. i can install with the www subdomain no problem, but not the root domain. here's the error i'm ...
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0answers
73 views

telnet “connection closed by foreign host” for some servers, not all

I started having issues connecting to our mail server on 1 server, but the others are able to connect without issue. telnet my.smtp.server 25 Trying 1.2.3.4... Connected to my.smtp.server. Escape ...
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0answers
30 views

Implementing OpenVPN dynamic challenge/response

The OpenVPN docs for the management system (ref) say that dynamic challenge/response "works by returning a specially formatted error message after initial successful authentication." In theory, this ...
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0answers
14 views

Setup router iptables like VPN for single pc

I'm currently far away from my office for a family visit. One of the applications got frozen and needs a restart. The config files are set up to only accept logins from local ips. Only device I ...
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0answers
120 views

Cannot telnet to port from Azure VM

I have an Azure VM setup and I have a program that SSH's out from that VM to port 7022 on my supplier's server. Sometimes I am unable to connect to this port and this can last for up to 30 minutes or ...
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0answers
11 views

Cannot connect to smtp mail server [duplicate]

I have an installation of Postfix & Dovecot on a Centos 7 server. While being logged into the server via ssh I am able to use telnet and openssl to connect to localhost like openssl s_client -...
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0answers
146 views

Windows Telnet Could Not Open Connection On Any Port, Connect Failed

Configuration: Host: Hyper-V Windows 2008 R2 Guest: Windows 2008 R2 No firewall, no antivirus Problem: After 5 or 6 days, the guest cannot make any TCP connection to outside, neither can do to ...
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3answers
170 views

IMAP Port 143 Not Functioning When Using Hostname?

I am setting up a Mail Server on Azure (Windows Virtual Machine) using HMail and its all working great apart from not being able to connect my Outlook on my home PC. I believe the issue is that when ...
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0answers
195 views

Solaris 5.10 telnet connection closed by foreign host

I try to connect to a Solaris 5.10 server using telnet, but I only see: $ telnet xxx.xxx.xxx.xxx Trying xxx.xxx.xxx.xxx... Connected to xxx.xxx.xxx.xxx. Escape character is '^]'. Connection closed by ...
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1answer
680 views

Telnet: Unable to connect to remove host: Connection refused (Postfix - Ubuntu 14.04 VPS)

I have installed postfix following this tutorial but when I try to telnet mail.mydomain.com 110 (995,993,143 or 25) it throws the following error: Telnet: Unable to connect to remove host: Connection ...
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votes
2answers
796 views

Sending Email by SMTP IIS7.5 via php site

After my company decided to change the website we switched from old ASP.NET site to new website created in Drupal(php). The site is running locally on IIS7.5 and we also have virtual SMTP server on ...