Repeated connections to port 25 with firewall

[Matthew Seaman]

On Mon, May 24, 2004 at 01:29:57PM +0100, Jonathon McKitrick wrote:
> 
> This is probably a simple question with a simple answer, but I wasn't sure
> where to look.
> 
> I recently installed a deny-all firewall and everything is working fine.
> However, I keep getting /kernel log messages about attempts to connect to
> port 25.  Are these just various processes trying to mail their results to
> root, but can't because of the firewall?  Or maybe cron doing the same thing?
> 
> May 24 08:00:00 neptune /kernel: Connection attempt to TCP 127.0.0.1:25 from
> 127.0.0.1:1101 flags:0x02
> May 24 08:00:00 neptune /kernel: Connection attempt to TCP 127.0.0.1:25 from
> 127.0.0.1:2270 flags:0x02
> May 24 08:05:00 neptune /kernel: Connection attempt to TCP 127.0.0.1:25 from
> 127.0.0.1:4230 flags:0x02
> May 24 08:10:00 neptune /kernel: Connection attempt to TCP 127.0.0.1:25 from
> 127.0.0.1:2687 flags:0x02
> May 24 08:15:00 neptune /kernel: Connection attempt to TCP 127.0.0.1:25 from
> 127.0.0.1:3274 flags:0x02
> May 24 08:20:00 neptune /kernel: Connection attempt to TCP 127.0.0.1:25 from
> 127.0.0.1:1542 flags:0x02
> May 24 08:25:00 neptune /kernel: Connection attempt to TCP 127.0.0.1:25 from
> 127.0.0.1:3652 flags:0x02

If you're using sendmail, that the client mail submission instance
trying to hand off a message to the MTA instance.  If you type

    # mailq -Ac

you should be able to see what been queued up.

You will have to alter your firewalling to allow TCP connections
localhost:any -> localhost:smtp in order to get e-mail working on that
machine.

	Cheers,

	Matthew

-- 
Dr Matthew J Seaman MA, D.Phil.                       26 The Paddocks
                                                      Savill Way
PGP: http://www.infracaninophile.co.uk/pgpkey         Marlow
Tel: +44 1628 476614                                  Bucks., SL7 1TH UK
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