Re: Please help! Pretty please? (DNS trouble, I think)

From: P.T. Breuer (ptb_at_oboe.it.uc3m.es)
Date: 01/18/04 

Date: Sun, 18 Jan 2004 22:40:17 GMT

Carlos Moreno <moreno_at_mochima_dot_com@xx.xxx> wrote:
>
> I log on to the server (it's a "dedicated server" that
> we're renting from a web hoster -- it has "direct"
> connection to the net, with a static IP address), and
> type the command:
>
> $ telnet localhost 5555
>
> For about ten seconds I have no reply. Then, I get the
> expected:
>
> Trying 127.0.0.1...

Your resolver is broke. Your /etc/hosts is bust. "localhost"
must resolve immediately via /etc/hosts.

> telnet: connect to address 127.0.0.1: Connection refused

>
> (there's nothing listening on that port, and there is no
> iptables rules affecting that port either)

Nothing surprising, then.

> $ telnet 127.0.0.1 5555
>
> Then I get the expected response in zero time.

There you are - broken /etc/hosts. It's a name resolution issue.
And hosts.allow probably doesn't allow your access from your hostname,
nor does xinetd. Read logs and know more.

> The file /etc/hosts contains the following: (I changed
> the actual IP addresses and names, but other than that
> this is verbatim what the /etc/hosts file contains)
>
> --- FILE CONTENTS BEGIN ---
> # Do not remove the following line, or various programs
> # that require network functionality will fail.
> 127.0.0.1 localhost.localdomain localhost

And where is the entry for your own hostname (a FQDN)?

> 1.2.3.4 www.domain.com
> 1.2.3.5 secure.domain.com
> 1.2.3.6 mail.domain.com
> --- FILE CONTENTS END ---
>
> The file /etc/host.conf contains a single line:
>
> order hosts,bind
>
> Can you think of something that could explain this

Yes - broken /etc/hosts, hostname, etc. Even hosts.allow/deny
and xinetd.conf in combo with broken hostname, domainname, etc.

Peter

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