how to use Telnet

Replies

• 

  Mahesh Dahale

  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.
  #-Link-Snipped-#
• 

  durga ch

  .. or
  cmd prompt
  >telnet 23
  
  23 being the port.
• 

  Manish Goyal

  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
• 

  Anil Jain

  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
• 

  vik001ind

  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.