[ubuntu] telnet ip address port 80

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http://ubuntuforums.org – I've built two ubuntu systems in vm. Set the IP as for machine A and for machine B. Both machines can connect to Internet. If I try to ping on machine A, it works, and vice versa. If I try command "telnet 21", it works too. But when I try command "telnet 80" on machine A, it doesn't work. It says "connection refused". Even if I try "telnet 80", it still doesn't work. But the machine can open website and if I try "telnet www.google.com 80", it works. I wanna know (Hardware)