I am doing telnet as
telnet www.google.com 80
It is showing Trying 216.58.193.164....Nothing happens after that. but when I tried
telnet www.google.com 443
It works well and shows
Trying 216.58.193.68...
Connected to www.google.com.
Escape character is '^]'.
My all outbound ports are open. Then what can be the reasons for this problem?
What error symptoms do you see? When I issue that command, I see this:
% telnet www.google.com 80
Trying 216.58.218.164...
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
connection timed outafter 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.