Skip to main content
The 2024 Developer Survey results are live! See the results

Questions tagged [telnet]

An unencrypted client/server protocol for remotely accessing another system.

Filter by
Sorted by
Tagged with
0 votes
1 answer
37 views

Why does the network card on a Linux system boot on its own?

When I was using Telnet to remotely access my target computer on Windows and conducting latency testing with cyclictest, after several hours of execution, I suddenly found that the telnet connection ...
Vimer's user avatar
  • 67
-3 votes
1 answer
101 views

What is the counterpart of telnet client for servers based on UDP?

Telnet client is said to communicate only with servers which are based on TCP, not with those on UDP. What is the counterpart of telnet client for servers based on UDP?
Tim's user avatar
  • 103k
0 votes
1 answer
177 views

Using telnet command without protocol negotiation

I'm using telnet to connect to a serial port via a TCP/IP server. I need a raw, unfiltered, unbuffered connection, and can get most of the way there, but no matter what I do telnet sends protocol ...
Daniel Griscom's user avatar
0 votes
1 answer
53 views

Are e-mails to localhost logged with sSMTP?

I don't suppose that sSMTP will work for just sending mail on the localhost? nicholas@mordor:~$ nicholas@mordor:~$ sudo cat /etc/ssmtp/ssmtp.conf # # Config file for sSMTP sendmail # # The person who ...
Nicholas Saunders's user avatar
0 votes
0 answers
122 views

how to test HELO/EHLO email error with Gmail using sSMTP?

As SSMTP doesn't run as a daemon per se, how do you test that it's working? nicholas@mordor:~$ nicholas@mordor:~$ telnet localhost 25 Trying 127.0.0.1... telnet: Unable to connect to remote host: ...
Nicholas Saunders's user avatar
0 votes
0 answers
18 views

How to know if telnet stream is at await state or not from looking at the logs

I have started a telnet session and it prints the output to a file and i give commands to the telnet after analyzing the log file log.txt. Below is the bash code cat my1.fifo | telnet 172.27.172.150 ...
Anubhav Rai's user avatar
0 votes
4 answers
552 views

Is it "telnet:" or the port 4161 that is telling me that I'm connecting to an UDP server?

I am asking this question because I am not meeting UDP and telnet often... To prepare myself for a development, I am reading a documentation where I will have to connect to a telnet://x.y.z:4161 url. ...
Marc Le Bihan's user avatar
0 votes
1 answer
147 views

HTML telnet howto do

I have this code: <a href="telnet://localhost:33330"> <button>MUD</button> </a> <a href="telnet://localhost:24"> <button>Renegade BBS</button&...
ignatius's user avatar
  • 401
1 vote
0 answers
596 views

how to find the telnet ip address and port number of hosts running in eve-ng VM?

I am running an eve-ng VM, and running a couple of nodes (routers) in it. The common problem is, when I click on the nodes, it opens its console in the browser. I installed the client side pack, but ...
Abhishek Sagar's user avatar
0 votes
1 answer
704 views

How to see details of TLS telnet?

Debian (and other distro if you recompile the source) can use a ssl version of telnetd. telnet-ssl -z cacert=/etc/ssl/certs/mydomain.crt -z cert=/etc/ssl/certs/client.mydomain.crt -z key=/etc/ssl/...
elbarna's user avatar
  • 12.8k
1 vote
1 answer
8k views

Telnet connection refused

I have been trying to connect using telnet. I keep on getting Connection refused. After checking ports listening, I observed the port is listening to the localhost IP 127.0.0.1 but I wanted it to ...
James Emeka's user avatar
0 votes
0 answers
44 views

Source env variable resolved instead of local env variable

I am having the following issue with Enviroment variables: In my linux server I have an enviroment variable HOSTNAME (has value SERVER_HOSTNAME) In my Linux box I have another enviroment variable ...
HassanChe's user avatar
1 vote
0 answers
104 views

.telnetrc not being read at startup of telnet

I'm trying to set up some telnet commands in ~/.telnetrc and they are not being read. The file is DEFAULT mode line When I go into telnet and do a "display", I get ... environ ...
Larry_C's user avatar
  • 111
2 votes
1 answer
364 views

ansible telnet isn't working

I am trying to use the telnet command with ansible expect module to push initial configuration but it's not working, I am suspecting the issue is with the responses section, here is my playbook: - ...
Somayyah Mohammed's user avatar
0 votes
1 answer
798 views

telnet with ansible to cisco switch isn't working

I have a cisco switches in my lab, since they initially have telnet connection configured I want to use it for initial configuration with ansible (SSH access, hostname, domain ... etc). I'm trying to ...
Somayyah Mohammed's user avatar
0 votes
0 answers
212 views

How can I write a command into a subprocess?

Currently, I am working on a project where I use telnet to netcat to send an email message within my university. I am trying to make the process automated but my script can't seem to enter in any ...
Mitchell Zhou's user avatar
0 votes
0 answers
543 views

SSH or telnet as an unpriviledged user leads to 'socket: Permission denied' error

I'm running a strange 3.0.35 heavily patched kernel on an embedded device (Kobo eReader). Maybe it partly explains this issue.Basically: kobo:/$ ssh [email protected] socket: Permission denied ssh: ...
Nicolas Mailloux's user avatar
0 votes
0 answers
429 views

Not able to grep telnet output correctly

I am writing an script to verify connectivity for multiple external system with timeout of 10s. How do i avoid "Connection closed by foreign host" text from this script. I am doing grep only ...
rizwan's user avatar
  • 11
0 votes
1 answer
223 views

Unable to get PID on a Listening port for Solaris

I'm using solaris SunOS myhost4 5.11 11.4.42.117.3 sun4v sparc sun4v non-global-zone I'm sure that port 7777 is in use as the telnet is successful as below: $ telnet myhost4 7777 Trying 10.23.52.219.....
Ashar's user avatar
  • 511
0 votes
1 answer
536 views

Is there an alternative for xinetd that supports control characters?

I am writing a project that allows users to connect in and run specific commands. xinetd is an option but pressing Tab via either nc or telnet will type an indentation. Is there a net daemon that can ...
Steven Yang's user avatar
0 votes
0 answers
3k views

Telnet error - "Connection timed out"

I am trying to telnet a port at a client's location. telnet someexampledomain.com 25 It shows: Trying someexampledomain.com... telnet: connect to address someexampledomain.com: Connection timed out ...
Rashy's user avatar
  • 101
1 vote
0 answers
1k views

Issue when installing telnet on centos8

I am trying to install telnet on a centos8 server but keep getting this error: I have also used dnf command(dnf install telnet) but get the same error message. I use the following on line tutorial ...
user518510's user avatar
0 votes
1 answer
2k views

ufw won't allow connections to postgres port 5432

With ufw disable on remote postgres system i'm able to connect from my local system However, the connection does not work when I ufw enable as shown below: C:\Users\HOME>telnet 80.240.24.195 5432 ...
Ashar's user avatar
  • 511
1 vote
0 answers
73 views

How many simultaneous terminal pseudo connections can support my linux server?

My debian distribution has 62 virtual text terminal in /dev/tty. Does this mean that my server can support up to simultaneous 62 ssh or telnet connections? For each connection I note that it created ...
hamza maimi's user avatar
0 votes
1 answer
888 views

Firewall is active, added port to iptables but still cannot connect

We have RedHat 8 server. Firewalld is active. I need to connect to port 5050 from my lap top and from the second server, so I added it to the rules iptables -I INPUT -p tcp -m tcp --dport 5050 -j ...
AndreyS's user avatar
  • 258
0 votes
2 answers
1k views

Unable to connect telnet to mysql listen ip port from remote host

I m able to telnet locally to mysql process like below: I have also made sure MySQL process is listening on all IPs by setting bind-address = 0.0.0.0 as evident below: root@localhost:~# netstat -plutn ...
Ashar's user avatar
  • 511
1 vote
1 answer
379 views

Raspberry PI ArchLinux telnet server 4 times Login incorrect

I installed via pacman -S inetutils telnet and want to try to login via telnet but if i use telnet localhost to connect This comes up [root@alarmpi ~]# systemctl restart telnet.socket [root@alarmpi ~]#...
kingingo's user avatar
0 votes
0 answers
537 views

Get screen serial port in remote

I have some industrial equipment with serial ports equipped. There are 2 serial ports on each one (COM1 /dev/ttySC0 and COM2 /dev/ttyAMA0). Before sending to production, to test the correct ...
Fco Javier Balón's user avatar
-3 votes
2 answers
2k views

How to disable telnet on a Debian 11

As per title, how can I disable telnet on a Debian 11 server? I think I can (how?) block port using ufw, but... how can I disable the service itself? I tried systemctl disable telnet But Failed to ...
realtebo's user avatar
  • 957
1 vote
2 answers
661 views

linux telnet server check password file

in linux centos 7 linux using telnet server What is the name of the file responsible for checking the password, whether it is valid or not?
mohammed moha's user avatar
0 votes
1 answer
227 views

centos 7 decrypt and encrypt library [closed]

I have installed telnet server in my centos 7. I need to make some modifications to the telnet connection to the server. I have a library to check telnet login. It is encrypted. I need a decoding ...
mohammed moha's user avatar
0 votes
1 answer
419 views

listener message on port 23

I want to have a message to anyone that tries to telnet (port 23) to my server that they are connecting to the wrong port, then disconnects them. Basically something like socat would be ideal, but I ...
Alistair Ross's user avatar
0 votes
0 answers
1k views

Asynchronous json post requests with cURL, minimize overhead?

I think my method to make asynchronous post requests to API endpoint has some overhead. From stackoverflow I learned that libcurl is an alternative way but I am not familiar with libcurl and that with ...
hillsonghimire's user avatar
0 votes
1 answer
206 views

Help with a deciphering command with telnetd in it

Help with deciphering commands [ $1 -ge 20 ] && telnetd -p 233 -l /bin/sh I know /bin/sh is a Bourne shell and telnetd is a telnet daemon but I'm not sure how they work together. I think ...
Rick T's user avatar
  • 357
0 votes
0 answers
312 views

Telnet not working for a specific process

I have etcd process running on serverA on port 2379. I am trying to telnet to serverA from serverB and its showing connection refused. # telnet <IP_serverA> 2379 telnet: Unable to connect to ...
Rajan Sharma's user avatar
0 votes
1 answer
2k views

Telnet not working for non root user RHEL 8.2

I am getting the following error when trying to use telnet in RHEL 8 telnet: Command not found. I have installed telnet and telnet-server however strangely telnet is working when i am the root users ...
Max Powers's user avatar
0 votes
1 answer
1k views

netcat / nc / telnet perform math on received data then output

I am not an expert on bash so sorry in advance. For my high school CTF competition, I have to read in 3 numbers, perform some arithmetic on them, then output the value back to the server. In ...
Peter Stenger's user avatar
1 vote
2 answers
12k views

Failed to start Telnet Server: "Unit telnet.service not found"

I am doing a research on Telnet communication and I need to test its communication although it is not secure. I have an Ubuntu machine 18.04 on my EC2 (I opened inbound port 23 for everyone in AWS). I ...
E235's user avatar
  • 383
4 votes
1 answer
12k views

Testing connectivity and port availability using SSH instead of Telnet

Assume that you have a pair of UNIX/Linux machines. You want to check if both machines can connect to each other via an arbitrary port, say, TCP 111. Log into the shell of Machine 1 (10.0.0.1). If ...
Culip's user avatar
  • 144
1 vote
1 answer
1k views

How to establish tcp connection between host to vm using ssh or telnet

As a part of learning, I'm trying to establish a tcp connection between host and VM using telnet or ssh. I'm using linux-debian. After establishing connection, I'll try to analyse packets using ...
Umar Farooq's user avatar
2 votes
1 answer
1k views

What's the difference between the telnetd and inetutils-telnetd packages in Ubuntu?

Recently, a work came to me which needs to set telnet on linemode.so i install telnetd with apt install telnetd, which is controlled by inetd, and this operation will add new line telnet stream tcp ...
zzsuki's user avatar
  • 21
0 votes
2 answers
790 views

How to connect to a telnet service by bash?

What I am trying to do is connect through telnet and download a database but I can't find the way to do it, I have tried it with python but it only closes the connections, so I would like to know if ...
Christian Gtz's user avatar
1 vote
2 answers
444 views

telnet & ping - different results

I'm trying to debug a private connection between to CentOS servers I'm trying to connect to MySQL from server 1 ( Web ) to server 2 ( MySQL ) On both I've setup the network devices with firewalld - ...
cybernet2u's user avatar
1 vote
1 answer
764 views

Share Telnet connection as a proxy

i have telnet connection to device behind firewall (there is no SSH) and i want to use this connection as a proxy to give local network access to Firefox for example if is possible using Putty ...
Antonio Italiano's user avatar
2 votes
1 answer
1k views

Telnet connection to Debian machine refused

I'm trying to connect Debian 8 machine via telnet but I get login error shown in below # telnet 192.168.88.48 Trying 192.168.88.48... Connected to 192.168.88.48. Escape character is '^]'. Debian ...
Hakkı's user avatar
  • 27
1 vote
1 answer
1k views

How to determine Connection Refused Issue? [closed]

We have a linux server which runs a java process(Hazelcast) on port 5701. However, we are facing issue while connecting to that server and it result in a Connection Refused issue. Below are the ...
Siddhant's user avatar
  • 111
0 votes
2 answers
569 views

Stay connected while executing a remote WGET command?

I use Putty to remotely login into SERVER 1 and issue a WGET to another SERVER 2 to make a backup of a large directory. My question is, do I have to stay connected while this process occcurs? Or, is ...
Kon's user avatar
  • 1
1 vote
0 answers
5k views

Telnet: Connection refused for specific port only. [CentOS 8]

I am trying to connect from one server to another through its IP address using telnet as following: [root@01 ~]# telnet 10.10.7.7 6379 Trying 10.10.7.7... telnet: connect to address 10.10.7.7: ...
Eng7's user avatar
  • 1,691
1 vote
1 answer
7k views

Ping works, but I get 'No route to host' even though my firewall is off

I want to check if I can connect to Rspamd's Fuzzy port and have a very strange problem - I can ping a the host and get an answer (0% packet loss). But when I try to telnet him, I get "No route to ...
manifestor's user avatar
  • 2,483
0 votes
1 answer
6k views

vsftp server returning 500 Illegal PORT command when tried to run raw ftp commands in telnet

Currently, I am trying to run ftp commands from telnet client. I was successful with USER, PASS, PASV, LIST and when tried PORT vsftp server is throwing 500 Illegal PORT command. I am following the ...
m0hithreddy's user avatar

1
2 3 4 5