[CentOS] Could not connect to host box.domain.tld

Thu Jan 24 16:30:34 UTC 2008
Anne Wilson <cannewilson at googlemail.com>

On Thursday 24 Jan 2008, Craig White wrote:
> On Thu, 2008-01-24 at 15:24 +0000, Anne Wilson wrote:
> > On Thursday 24 Jan 2008, Alain Spineux wrote:
> > > On Jan 24, 2008 12:53 PM, Anne Wilson <cannewilson at googlemail.com> 
wrote:
> > > > I have used fetchmail/procmail/postfix/dovecot/kmail for some time on
> > > > my mail server, and have set this up on three or four machines in the
> > > > past. I'm now setting up a new server and having problems.  I've
> > > > reached the thinking-in-circles stage, so need a prompt.
> > > >
> > > > The box in question is called borg2.lydgate.lan, and resides at
> > > > 192.168.0.40. I can ping both borg2.lydgate.lan and 192.168.0.40, yet
> > > > kmail tells me that it cannot connect to it, either by name or ip.
> > > > /etc/hosts has correct lines for the box.  It has to be something
> > > > pretty basic, but I can't think what, unless it is either an selinux
> > > > problem or ipv6 problem.  I know that in FC6 I turned ipv6 off (I'd
> > > > have to search to find how to do that again).
> >
> > Thanks for replying.
> >
> > > What about firewall rules ?
> > > # iptables -L
> >
> > I've not used iptables directly before, so perhaps you'd look over the
> > current status:
> >
> > iptables
> > Chain INPUT (policy ACCEPT)
> > target     prot opt source               destination
> > RH-Firewall-1-INPUT  all  --  anywhere             anywhere
> >
> > Chain FORWARD (policy ACCEPT)
> > target     prot opt source               destination
> > RH-Firewall-1-INPUT  all  --  anywhere             anywhere
> >
> > Chain OUTPUT (policy ACCEPT)
> > target     prot opt source               destination
> >
> > Chain RH-Firewall-1-INPUT (2 references)
> > target     prot opt source               destination
> > ACCEPT     all  --  anywhere             anywhere
> > ACCEPT     icmp --  anywhere             anywhere            icmp any
> > ACCEPT     esp  --  anywhere             anywhere
> > ACCEPT     ah   --  anywhere             anywhere
> > ACCEPT     udp  --  anywhere             224.0.0.251         udp dpt:mdns
> > ACCEPT     udp  --  anywhere             anywhere            udp dpt:ipp
> > ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:ipp
> > ACCEPT     all  --  anywhere             anywhere            state
> > RELATED,ESTABLISHED
> > ACCEPT     tcp  --  anywhere             anywhere            state NEW
> > tcp dpt:smtp
> > ACCEPT     tcp  --  anywhere             anywhere            state NEW
> > tcp dpt:nfs
> > ACCEPT     tcp  --  anywhere             anywhere            state NEW
> > tcp dpt:ssh
> > ACCEPT     udp  --  anywhere             anywhere            state NEW
> > udp dpt:netbios-ns
> > ACCEPT     udp  --  anywhere             anywhere            state NEW
> > udp dpt:netbios-dgm
> > ACCEPT     tcp  --  anywhere             anywhere            state NEW
> > tcp dpt:netbios-ssn
> > ACCEPT     tcp  --  anywhere             anywhere            state NEW
> > tcp dpt:microsoft-ds
> > REJECT     all  --  anywhere             anywhere            reject-with
> > icmp-host-prohibited
> >
> > > Did you tries do login localy ?
> > >
> > > # telnet localhost 25
> > > ...
> >
> > That's OK.
> >
> > > # telnet localhost 110
> > > ..
> > > # telnet localhost 143
> > > ..
> >
> > Both these produce ''Temporary failure in name resolution'.
> >
> > > Remotly ?
> > >
> > > # telnet 192.168.0.40 25
> > > ...
> > > # telnet 192.168.0.40 110
> > > ...
> > > # telnet 192.168.0.40 143
> > > ...
> >
> > telnet: Unable to connect to remote host: No route to host
> >
> > How can that be?  Pings work OK.
> >
> > > Did you in your logs ?
> >
> > After the last postfix reload there is
> >
> > postfix/smtpd[3284]: connect from localhost[127.0.0.1]
> > postfix/smtpd[3284]: disconnect from localhost[127.0.0.1]
> >
> > That looks a bit odd.  Apart from that, I can't see anything relevant.
>
> ----
> the first 4 lines of /etc/hosts should look like this and apparently,
> yours doesn't...
>
> # head -n 4 /etc/hosts
> # Do not remove the following line, or various programs
> # that require network functionality will fail.
> 127.0.0.1       localhost.localdomain localhost
>
> ::1             localhost6.localdomain6 localhost6
>
> Fix this first
>
They do look exactly like that :-)

Two minutes ago the problem was solved.  Sheer stupidity.  I had forgotten to 
chkconfig on.  Dovecot is now running and it looks as though I can now 
continue with preparing the account to take over the work.

Thanks to all who tried to help.

Anne


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