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When I visit http://ip:port ,it's OK.

But when I telnet ip port,connection is refused.

How is this kind of effect achieved?

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Perhaps you browser is setup to use a proxy server and you are not making a direct connection. – Zoredache Aug 18 '11 at 2:42
How to emulate proxy with telnet? – telnet Aug 18 '11 at 2:49
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closed as not a real question by ErikA, Zoredache, womble, John Gardeniers, mrdenny♦ Aug 18 '11 at 2:50

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1 Answer

up vote -3 down vote

When you do

http://ip:port

You are in fact sending messages as http and when you do

telnet ip port

you are in fact sending messages as TCP via port 23. Perhaps Port 23 of remote machine is blocked by some firewall.

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HTTP runs over TCP like telnet does, so implying one way connects by HTTP and the other way by TCP is not accurate. Using telnet with a port number does not connect to port 23, it connects to the port number you specify, so a firewall blocking port 23 is irrelevent. – TessellatingHeckler Aug 18 '11 at 3:01
Hmm, thanks for that clarification. I guess I got that wrong, :( – gokul varma nk Aug 18 '11 at 4:36
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