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I have windows Xp , I want to test some port , someone advice me to use telnet command on localhost to test it . but i don't know how i can do it (syntax of telnet command on local host) ?

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migrated from Jan 21 '11 at 10:56

This question came from our site for system and network administrators.

You can do this by executing the Command Prompt (Start -> Run -> cmd)

Once you get the command prompt you can test the port by writing this on the command prompt

telnet localhost PORTNUMBER
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I assume you're trying to test the HW port - if so, this may not get you what you want. I don't know Windows networking as well as another OS, but the OS will likely short circuit the data path and never actually hit the hardware. – Shannon Nelson Aug 5 '11 at 3:53

on win 7 i found why telnet not work.

go to

Control Panel\All Control Panel Items\Programs and Features

Then click on Turn Windows features on or off on left side panel and checked Telnet Client and Telnet Server. after click OK, you can use this in windows command prompt (cmd).

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to learn some of the syntax from the command prompt type:

c:\telnet /?

Typically you would do something like the following and see what kind of message pops up. Sometimes it may connect but nothing gets displayed. If the port is closed, then there is an error of some kind... even if nothing displays in a couple of seconds, just type "quit" to close the connection.

c:\telnet IPAddrOrHostname Port#
c:\telnet 25
c:\telnet 80
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