I am doing telnet as

telnet www.google.com 80

It is showing Trying happens after that. but when I tried

telnet www.google.com 443

It works well and shows

Connected to www.google.com.
Escape character is '^]'.

My all outbound ports are open. Then what can be the reasons for this problem?

  • If the message you are getting something like connection timed out after a while, your firewall ports are not as open as you might think. If this is a corporate environment, there might be a stateful packet inspection going on and telnet is not allowed in most everywhere I have been, in the past few years. – MelBurslan Mar 21 '16 at 13:41

What error symptoms do you see? When I issue that command, I see this:

% telnet www.google.com 80
Connected to www.google.com.
Escape character is '^]'.

That is correct behavior. The HTTP client must issue a command at this point in the protocol. If you type:

GET / HTTP/1.1
Connection: close
Host: www.google.com

And hit "return" twice, you will see HTML sent by www.google.com

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