Questions tagged [telnet]

Telnet is a client-server protocol used to allow communication between computers in a network.

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Telnet “invalid message format”

I started a local Telnet server that listens on port 5555. ~$ telnet localhost 5555 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. Hello Invalid message format Telnet was ...
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Cannot open 8080 port on EC2

I use AWS Ubuntu Instance and try to open port 8080. This is my "Security Groups" settings: ec2 image I have added port 8080 to iptables: sudo iptables -L Chain INPUT (policy ACCEPT) target ...
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Domain for telnet service

I have a domain, I have working telnet service: telnet x.x.x.x 5555 I want to connect it to my domain, i.e. telnet example.com 5555 How can I do this?
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Why does telnet send CRLF when I press enter?

On the telnet provided with my system (Debian), line feeds (\n) seem to be translated to CRLF (\r\n). Specifically, if I run, e.g., netcat -l -p 3334 > file and run echo a | telnet localhost 3334 ...
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TCP RST when connecting via telnet to the application - Windows

I have an application running on Windows. The application listens on port 54000. I can connect to the application from the local machine and it works fine: telnet 127.0.0.1 54000 Now, I am trying to ...
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Cannot connect to MS SQL RDS instance

I can´t Connect to my RDS MSSQL instance. The 'Public accessibility' is set to Yes the subnet goups are using 2 VPC subnets subnet A: CIDR 10.70.2.0/28 subnet B: CIDR 10.70.2.16/28 Both subnets has ...
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33 views

How to forward my service from localhost to the internet?

I have made my personal tcp service that works on port 44444 through telnet as a communication protocol. The service itself is just a simple guess game written in C. I am working on Fedora Linux and ...
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50 views

Bypass Linux password login with netcat or ssh or telnet

How can you bypass a password login with nc or ssh? I type 'nc IP-address 13880' and it gives me the login form I need to bypass. Can anyone give me any tips?
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EVE-NG can't open telnet session from ESXi server with ConEmu

I can't seem to open ConEmu with telnet on my Windows laptop from EVE-NG (see picture below). EVE-NG is installed on ESXi on a little server in my LAN that lives in the same subnet. I want to use ...
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Cannot Telnet to a device

I have this Biometric Device and I can ping the device but I can’t telnet to the port that the device does. Here’s I can’t telnet my device. I already turned off the firewall and AntiVirus app with ...
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59 views

Telnet connection failing via port 23 (port is open on the server)

I have a Windows Domain controller and a Windows 10 Work Station set up from my VirtualBox. I am trying to connect to the Work Station on my domain via telnet on my Windows domain controller. It ...
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Can't telnet device on same network from device connected to repeater

Setup I have two wireless APs: A wireless modem router (GW) An AP acting in client mode (WAP-C) - aka repeater Device connected directly to GW (Ethernet): AV receiver (AV) with a web interface ...
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1k views

How to pass commands to a telnet window with a batch script?

I'm trying to control a wifi device with a batch script using the telnet command in Windows 7, but I don't know how to pass the commands to the telnet window. This will be a part of a longer script ...
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25 views

Telnet client line history

When I connect to the Telnet server, it keeps a line history. Unfortunately the history doesn't survive a logout. At the next login everything is gone. I use the Telnet only for entering command ...
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How does Telnet know where a host is when routing over the internet?

I am fairly new to studying networking, and this is something I have been wondering even though it may be a basic question. I've spoken with people in the networking world and they talk about having ...
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How to install Telnet from a PowerShell Core prompt

To install Telnet in PowerShell you can run: Install-WindowsFeature -name Telnet-Client This unfortunately does not seem to work in PowerShell Core where it produces the following error: Install-...
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Is this server IP + PORT reachable from my server? (using Telnet)

I am not so into networking and I have the following doubt. I have to test if a specific port on a server it can be reached from another server (or if there is something that is blocking the request ...
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Why Does Telnet Succeed If No Route Back To Host That Initiates It

Machine A could not make a https connection to Machine B. I first used telnet to confirm a tcp connection could be made: telnet MachineB 443 This worked. So, I concluded that the network between ...
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155 views

PuTTY sending extra characters at the beginning of TELNET connection initialisation

When a TELNET session is initialised using PuTTY, I see that PuTTY is sending the following characters to the server at the beginning of the connection: ..... .....'......... I was able to capture ...
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22 views

Unable to connect to MySQL VM from host machine

I have an Ubuntu 18.04 Desktop 64 bit host machine. On this host machine, I have used VirtualBox to create an Ubuntu 18.04 Server 64 bit VM, and have installed MySQL on it, created a MySQL user, a ...
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74 views

Why is my use of telnet towards a web server providing inconsistent results to others with the same approach?

I'm trying to use port 80 to connect to a website(www.ucf.edu), and send a GET request, but I'm getting inconsistent results to other students using the same exact methods. We had to use SSH to ...
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47 views

Is it possible to set Telnet communication as higher priority than, e.g. file uploads?

My understanding of the internet is limited. However, I enjoy playing MUDs which are text games that communicate through telnet. I observe that every time an upload is made through our connection - ...
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How to open telnet/ssh to Dlink DSL-225 router?

have D-link DSL 225 router that locate at 192.168.1.1 , with nmap I get PORT STATE SERVICE 21/tcp open ftp 22/tcp open ssh 23/tcp open telnet 80/tcp open http 631/tcp open ipp when I ...
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57 views

How to run multiple networked applications concurrently on DOS?

For science, I am working on a Vagrant box for DOS. The virtual machine needs to support a remote command execution service, such as sshd or telnetd, so that administrators can run COMMAND.COM scripts ...
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135 views

What are my best option(s) if desiring to tunnel/reverse-proxy to-and-from a telnet server?

I have a quite small VPS abroad, and a BBS telnet server software that i wish to run locally. What are my options, If i wish to only use the VPS as a relay for connections, effectively and ...
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151 views

Cannot flash or connect to my Nucleo board (STM32F446) anymore

for some reason I cannot flash my Nucleo (STM32F446) board anymore. It used to work well... I got the following message: openocd -f ./cfg/openocd.cfg -c "program ./build/ch.elf verify reset" -c "...
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Can't connect to certain port - How to unblock port

I am running a Apache2 Webserver with PHP 7 and xdebug. I try to establish a connection between my IDE (Netbeans) and xdebug running on my webserver. I read here that I have to check if I can connect ...
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311 views

Putty sends double Enter (CR) when Enter is pressed

Whenever I press enter in Putty it sends a double enter. On my other PC the Telnet connection to the end device works perfectly. It must be a problem with this particular Putty session. Things I've ...
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How to enable Alt Gr or Alt keys on a Telnet Server

I'm running a telnet server KpyM on a Windows Server 2008. My telnet client is a Putty on my Windows 10 computer. I'm running a 16-bit DOS Application through telnet. I need to use the "\" on an ...
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what is the difference between telnet and netcat?

I am looking for an explanation where I can find the difference between telnet and netcat. In which cases should I use telnet and netcat. What a telnet can do that netcat can not do and vice versa. I ...
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Cancel Server Manager feature installation

I tried to install Telnet Client feature using Server Manager in a Windows Server 2016 and now is completely stuck at running stage. Now I just want to cancel this but there is no option anywhere. ...
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106 views

MathWorks is written for Lego firmware V1.03, but Lego is up to V1.10

MathWorks (MATLAB and Simulink) is/are written for Lego firmware 1.03! (with no TelNet ID/passkey) Versions 1.07 and 1.08 also do not require the ID/passkey. Versions 1.09 and 1.10 do require an ID/...
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VisualCron client software can not connect to its own server software

I use a job scheduler named VisualCron which has a server and a client component. I have the VisualCron server installed on a Windows Server 2012 R2 server. I have the VisualCron client installed on ...
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Telnet validate email, 550 MI:SPF error

When I try validating an email through telnet, using: Telnet MX.server.for.email.i.want.to.validate.com 25 HELO Buddy MAIL FROM: example email address I get a 550 MI:SPF error, telling me that ...
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910 views

Enable telnet and telnetd services on Busybox

In order to enable Telnet on Busybox, should be enabled both telnet client and telnetd server services?
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Telnet to Microsoft telnet server from a SSH Session

From my laptop, I need to SSH to a Windows Server and then, I need to telnet to a different server. I am able to SSH to the Windows Server, but I tried telnet , I am just getting an empty line and ...
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444 views

Simple TCP client with control over SYN, ACK, FIN

I am troubleshooting a problem with a telnet server on an embedded device and I need to recreate a specific process where a client closes the socket before the server has completed the initial ...
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45 views

Why only part of ports on my machine can be reached from external ip?

I'm trying to achieve my remote service with port 5601. But unfortunately i can't open the website. Here is something i tried to find out why it's not working: I logged in remote server and tried "...
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Batch suppress “Connection to host lost”

I am using the BOFH server to get random excuses, however whenever it runs it states "Connection to Host Lost" after it has run, since the server immediately disconnects (expected behavior). How can I ...
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304 views

Kill all the previous sessions in PuTTY

I've opened a telnet connection to another server, however when I close PuTTY it still looks like I am logged in to another terminal. I think this happens every time PuTTY gets idle. Does someone know ...
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137 views

Is it possible to contract a computer virus via telnet?

In the past there were many applications and also games where you could connect to via telnet. Back then viruses were not THAT far spread and used as they are now. What I'm wondering about is: ...
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How to telnet into a transparent bridged modem through router

So first off I guess what I want to do is be able to telnet into a transparent bridged modem to restart it. (The modem is a Actiontec c1100t) My router is a Linksys wrt1200AC running LEDE openwrt. If ...
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145 views

Can't open Telnet from Windows 10 PowerShell

It's enabled, but Telnet wont open:
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113 views

Linux: Telnet / SSH

we've got an old ERP system running on RedHat 5. Now we need to force users to use SSH instead of TELNET, but we can't turn off TELNET now. Is there some command to display, who is connected via ...
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432 views

Can ping but cannot telnet to a local network computer

This question follows How to create a network over usb? . I can ssh to a controller device. When I'm on it, I want to telnet to a running server on my computer. My computer and the device are ...
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can not type anything in blank screen when using telnet in cmd

i have a problem with telnet in cmd. i write this command in cmd: telnet cis.poly.edu 80 then i hit enter twice. at this time a blank screen appears but i can not type anything in this window. if i ...
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313 views

Trouble connecting to Ubuntu server using ssh

I been having trouble connecting to my Ubuntu 18.10 server using ssh. Whenever I try to connect with my college network this is the output ssh -vvv root@my.server OpenSSH_7.9p1, OpenSSL 1.1....
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VLC with telnet interface does not show GUI, consumes CPU

I want to control the VLC player via telnet. What I want is to be able to set media, play it and pause it. I found this command: vlc.exe -I telnet --telnet-password test It does work, I can connect ...
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2k views

telnet connection failed on port 23 [closed]

i'm suppose to log into remote machines using telnet but in the task i have, there's no ip adresses for that ! instead i have hostnames. i'm a bit new in this and i don't know what i'm suppose to get. ...
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430 views

how to close and start a program from cmd in Windows XP?

I've been trying cmd commands such as "taskkill" on Windows XP and apparently they don't exist. I'd like to be able to close and open a program from the cmd because I need to connect to the Windows ...

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