how to use Telnet

@manish-r2Hoep • Oct 22, 2024

Oct 22, 2024

860

hey guys
can any one help me learning about telnet...
i want to learn it...
can anyone help me how to use it...with some working commands....??????

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Mahesh Dahale

@mahesh-E2tZ3t • Sep 26, 2009

Most common ports to which one can connect to through telnet are:
Port 21 - File Transfer Protocol
Port 22 - SSH Remote Login Protocol
Port 23 - Telnet Server
Port 25 - Simple Mail Transfer Protocol (SMTP)
Port 53 - Domain Name Server (DNS)
Port 69 - Trivial File Transfer Protocol (TFTP)
Port 70 - Gopher
Port 80 - Hyper Text Transfer Protocol (HTTP)
Port 110 - Post Office Protocol 3 (POP3)
Telnet client and server functionality comes built-in in most operating systems.
On windows machines, telnet client can simply be started by issuing the telnet command in windows command shell. The following example would help you connect to a remote machine on the HTTP Port 80 and issue a GET command which would fetch a file as your web browser does it behind scenes:

Command Prompt> Telnet
Command Prompt> open (somedomain.com or ip address) 80
you can connect to any machine that has certain ports open. Once connected to a machine, you need to issue unix based commands to interact with the remote service.
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durga ch

@durga-TpX3gO • Sep 26, 2009

.. or
cmd prompt
>telnet <ip> 23

23 being the port.
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Manish Goyal

@manish-r2Hoep • Sep 26, 2009

thanks to all
but when i use this command
Command Prompt> Telnet
Command Prompt> open ip 21
it says connection failed...
is there any neccessity to have ftp server on remote computer
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Anil Jain

@CrazyBoy • Sep 27, 2009

If you want to telnet to system 'A' from system 'B', then Telnet service on both the system should be up and running. to start the Telnet service:

Windows + R "Services.msc"
Start Telnet service

-CB
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vik001ind

@vik001ind-rOaCSy • Sep 27, 2009

In Windows Vista & windows7 telnet is disabled by default because of its security issues (passes messages in plain text, easy to sniff passwords & credentials, so its obsolete now).
In order to enable go to control panel
> Programs
> Pragrams & Features
> click on 'Turn Windows Feature on or off' on the left panel
> new window appears, tick check boxes telnet server or telnet client or both as per your need.
> click ok
> open cmd & start telneting to another telnet enabled computers (for command
queries type telnet /? in cmd)

In linux, you have to edit file /etc/xinetd.conf & a telnet configuration file in /etc/xinetd.d/ directory. For further information google it.

As per your problem telnet should be enabled on port 21 on the remote host which is not common nowadays unless you configure it on your own.
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