[Watford] Debian Ports

[Alain Williams]

On Tue, Nov 01, 2011 at 11:09:50AM -0000, walt wrote:
> Hi all,
> 
> Hope you can help me.
> 
> I've got quite a long way with Linux over the past few months but I've run
> into a problem I just don't understand.  I've googled it to death but I
> still don't know enough to resolve the problem.
> 
> It's Debian Linux and it runs Apache, MySql, PHP and  SAMBA at the moment.
> 
> Everthing works fine.  Even the SAMBA shares function as they should and I
> can access all the shared folders from any windows pc.
> 
> However,  I also need odbc (3306), smtp (25) and pop3 (110)  connections
> from windows machines to work.  According to the network tools/port scan
> the required ports are open.  Here is the interesting thing; if I run a
> portscan as 'localhost' or 127.0.0.1 then ALL the ports are reported as
> open.  If, however,  I enter the ipV4 address of this machine and run the
> scan all the ports I need, apart from 80, are missing.  Port 80 appears on
> both local and lan ip lists.
> 
> In desperation I re-installed debian Linux from scratch but I got the same
> results.  I then uninstalled iptables but that made no difference either.
> 
> There must be a configuration file somewhere that needs changing, I just
> don't know which one.  I have already checked host.allowed and hosts.denied,
> they have no active entries.
> 
> Hope one of you can point me in the right direction.

2 possible causes, the applications are listening on the localhost address
or there is a firewall stopping external access.

The check the first run:

	netstat -ltp

To check the second run:

	iptables -L

-- 
Alain Williams
Linux/GNU Consultant - Mail systems, Web sites, Networking, Programmer, IT Lecturer.
+44 (0) 787 668 0256  http://www.phcomp.co.uk/
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