IPv6 address is not working in Ubuntu

Posted by Alex Farber on Super User See other posts from Super User or by Alex Farber
Published on 2012-11-29T09:45:52Z Indexed on 2012/11/29 11:10 UTC
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Telnet connection with echo service succeeds for localhost and host names, but fails with ::1 host name:

[email protected]:~$ telnet localhost 7
Connected to localhost.
Escape character is '^]'.

telnet> q
Connection closed.
[email protected]:~$ telnet ::1 7
Trying ::1...
telnet: Unable to connect to remote host: Connection refused
[email protected]:~$ 

My own program trying to talk using IPv6 address fails as well. Why IPv6 address is rejected?

OS: Ubuntu 12.04 32 bit.

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