Questions tagged [telnet]

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

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tcptraceroute is working but telnet got timeout

I'm trying to telnet public server using specific interface. # telnet -b 10.144.238.192 google.com 80 Trying 142.251.42.14... telnet: Unable to connect to remote host: Connection timed out If I test ...
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I have a VB script that opens Plink to communicate to a Cognex Insight sensor via Telnet. How to prevent exit when I send two {Enter} in a row?

The Cognex Insight smart sensor has a built in Telnet over ethernet protocol. I am using PuTTY to configure the Telnet communication. When PuTTY is started, it establishes communication with the ...
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Postfix not sending emails outside

so I'm trying to run a postfix app on my raspberry pi 4 following this tutorial: https://raspberrytips.com/mail-server-raspberry-pi/ But when I try to use telnet to send an email to an external mail, ...
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how do I issue Stop + A command via a putty telnet session for a solaris unix sparcstation (Solaris OS version 4.0)

I am struggling to issue a Stop + A command sequence on a Solaris Sun OS Sparcstation remotely. The ultimate goal is to be able to reboot the host machine without using shutdown or reboot commands. ...
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Ping Works But Telnet Connection Fails - VPN

My laptop is connected to VPN and this VPN created a new adapted with new IPv4 assigned. I'm accessing a specific server through VPN and I want to run an application on my laptop and I need it to be ...
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Link/protocol handler for telnet on Windows 11

The following configuration to open a telnet:// address does not work on Windows 11 . It was working on Windows 10 though HKLM\SOFTWARE\Classes\telnet\shell\open\command
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Check the nodes behind the load balancer with netcat

i have a Load Balancer and some servers behind the balancer, when i use netcat to check the connectivity with: nc -zv x.x.x.x xxxx but this only checks that the balancer side connectivity is active ...
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How to issue persistent commands on D-Link routers with factory firmware?

I recently bought a D-Link DIR-822 router and I can telnet into it and issue Linux commands. The thing is, say I issued random commands like; iptables -P FORWARD DROP iptables -I INPUT -p tcp --sport ...
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Telnet to public IP times out but doesn't when LAN address used

I have a new email server and and old email server on my network. I can send email to the new email server (let's call it mail.newmailserver.com) from Gmail and reply successfully (e.g. to/from works)....
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Can't telnet 9100 on 2 windows servers on same network

I have 2 servers A and B on same subnet. Both can't telnet each other on 9100 Connecting To (Server IP) ...Could not open connection to the host, on port 9100: Connect failed Both are 2012 R2 Both ...
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How to relay a local IP/Port, normally accessed through PuTTY using Telnet connection, to remote PC?

Normally I have access to a local Telnet device (static IP/Port), connected via LAN/ethernet to my Windows PC. I use PuTTY to setup a Telnet terminal and send/receive and go on with the job. Currently ...
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Unable to telnet to 127.0.0.1 (local Linux VM) to test SMTP port 25

I have the latest Kali Linux running on Hyper-V as a VM: Sendmail is installed (testing email server) Domain name purchased, say AlphaMoon.org with MX record pointing to my ISP IP address Netstat ...
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How do I enable telnet on a D-Link DIR-878 AC1900 router?

How do I enable telnet on a D-Link DIR-878 AC1900 router? I have tried everything, can someone help me? The firmware version is 1.30 and the hardware version is A1. If anyone wants more details, just ...
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How do I install telnet on windows 10 (Not enable, actually install)

I'm running a modified windows 10, meaning I went though the ISO and removed a bunch of stuff, runs super smooth. Anyway I suspect that telnet is one of the things that I pulled out because now, ...
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Firewall blocked port telnet 23

I have an one firewall table with several entries. Among these one entry is with destination port 23. I don't understand what's the meaning to block destination port 23. After asking my teacher to ...
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How to send escape character on telnet session while using Powershell 7 with a Portuguese keyboard layout

I've started a telnet session (ex.: telnet ip port) and I'm wondering if anyone knows how to send the escape char so that I can get the telnet> prompt back. I've already found this, but it seems ...
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telnet server on my centos 7 vps login log file

I have installed telnet server on my CentOS 7 VP I want a way to save no login attempts or a log file for all try login telnet from telnet on my VPs
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Is it possible to make Netcat behave exactly like Telnet?

Is it possible to make Netcat behave exactly like Telnet? The "-t" option doesn't seem to quite do it.
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Using ufw to block established telnet connection

I'm trying to learn ufw and I'm wondering if I can block established connections with it. I've made connection between my 2 computers using telnet and I'm trying to use ufw to block it. Tried many ...
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ZTE F660, /bin/sh: Access Denied

I have a problem with my router ZTE F660, V5.2.10P1T22S (btw same problem with F609). If I do telnet from device which is connected directly to the router (LAN/WiFi) - I get full telnet access. But if ...
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Telnet to Gmail SMTP "starttls auth" syntax error

When I Telnet gmail and send an email using cmd promt, everything works fine. After Telnet smtp.gmail.com 587, following conversation with the server happens: 220 smtp.gmail.com ESMTP m184sm839913wme....
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Why telnet works directly from command prompt but not with open command

When I use following command in command prompt then it works: telnet xxx.xxx.xxx.xxx 443 But if I open telnet client from command prompt and then try following command from withint telnet then it ...
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PuTTY sending extra garbage before each Telnet command

I'm trying to establish a Telnet connection to my 3d printer with PuTTY. It connects, but when I send a command I get echo:unknown command followed by the correct command I tried to send, in the ...
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DAP 1650 - What is the login password for the telnetd server?

I have a D-Link Wireless AC1200 dual band gigabit range extender (DAP-1650) and was trying to get into the telnetd server but I haven't got a password. I tried some of the usual ones: admin, password, ...
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Telnet and shell scripting. maintain session open and send data while the script is in execution

I want to send two or more messages to a TCP server using telnet client from bash. This implies that I should maintain the session open while my script is in execution. For example, the script flow ...
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ZTE F609, telnet issue

I have modem ZTE F609 (Software Version V7.0.10P7N1) and I can't telnet it because of wrong login/password. I tried many different variants (all that Google and my imagination provided me:D), like ...
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difference between nc and telnet using smtp service as an example

I can use both nc and telnet to connect to port 25. $ nc 192.168.1.120 25 220 localhost ESMTP Exim 4.68 Tue, 29 Dec 2020 06:07:27 +0000 $ telnet 192.168.1.120 25 Trying 192.168.1.120... Connected to ...
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Can access a website using browser, but not able to access through telnet

I have a client vm machine with https & DNS provided. If I am trying to access that site in browser I can access, but when I try from application it gives connection timeout or connection reset (...
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Why does s3.amazonaws.com respond with 400 Bad Request when I connect over telnet?

This is what my request looks like. I have confirmed that the end of line separator is CRLF: telnet s3.amazonaws.com 80 GET / HTTP/1.1 Host: s3.amazonaws.com User-Agent: Mozilla/5.0 (Windows NT 10.0; ...
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Connecting two computers using an Ethernet cable

When you connect two computers using an Ethernet cable (Crossover) you are technically using layer 1 and 2 technologies. Layer 1 = Ethernet cable (The signaling aspect) Layer 2 = The computer's NIC ...
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After `telnet`ing to a device, can not see the device prompt

I have a virtual router on a server and I have assigned a port no - 20171 to a serial port And I connect to this device using the cmd - telnet 10.X.Y.Z 20171 And after that I see something like this - ...
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macOS telnet connection refused

I use Termius to connect to a gateway, I am able to connect, but the command line is still - I can't write anything there. I am also trying to connect to a gateway using PuTTY, but the error I keep ...
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putty and remina work but telnet and ssh do not

I am connecting from a ubuntu 20.04 to a raspberry pi 4 B also on Ubuntu 20.04 telnet dies immediately ssh can be forced with ssh -T user@host however there is no prompt, the prompt can be restored by ...
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Telnet connect to localhost failed on windows subsystem WSL2 Ubuntu

I'm using Windows Subsystem (WSL2) Ubuntu 20.04, trying to run command telnet localhost 2181, but only got error message saying telnet: Unable to connect to remote host: Connection refused Tried the ...
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Telnet not working on Windows 10 after installing it

I have a windows 10 laptop (it's pretty old, but I don't think that should be a problem). I followed the instructions and went through control panel and enabled Telnet Client using an admin password. ...
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telnet to the local Sagemcom F@st 5260 router returns "Connection refused"

I have a router "Sagemcom F@st 5260" If I run telnet 192.168.1.1 from any local machine, then I get "telnet: connect to address 192.168.1.1: Connection refused telnet: Unable to connect ...
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Can you edit a file on a remote computer when there is no editor available?

I have an old Synology NAS which which I can only telnet in to and I want to edit a config file. Unfortunately there is no editing software at all; no vi, nano, vim nothing. Is there a way to use ...
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network connection works only once

I have setup a home server and did port forwarding for http/ssh/tcp etc on the router. It was working well until very recently. My problem is that now connections seem to work only once from outside ...
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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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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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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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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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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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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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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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