1 minute pause on sendmail login
sport
sport-light at sbcglobal.net
Wed Dec 21 15:44:26 UTC 2005
I see this on my laptop during boot, but I don't establish a connection
until after x is up. I would like to know where the time out is set as
well.
-cm
On Wed, 2005-12-21 at 17:10 -0600, Les Mikesell wrote:
> On Wed, 2005-12-21 at 16:57, Andy Pieters wrote:
> > Hi list
> >
> > I am seeing extreemly long login times on my smtp server. It pauses for ~1min
> > right after connection.
> >
> > telnet mail.vlaamse-kern.com 25
> > Connected to mail.vlaamse-kern.com
> > Escape character is '^]'.
> > ****PAUSES FOR 1 MINUTE***
> > 220 mail.vlaamse-kern.com ESMTP Sendmail 8.13.1/8.13.1; Wed, 21 Dec
> > 2005 18:38:21 +0100
> >
> > Further information: when I connect from the lan to port 25 on the public ip
> > address, the connection is refused, but when I connect from the lan to port
> > 25 on the server's private ip address, the connection is established and the
> > pause does not occur.
> >
> > Can anyone make sense of this?
>
> Sendmail will do a reverse DNS lookup for the IP address of the
> connection to put the name in the logs. Apparently this
> doesn't work for the address you are testing from and you
> wait for a timeout. Perhaps the delegated DNS server is
> blocked by a firewall that drops the packets. Likewise there
> is an IDENT query for the owner of the socket, but those
> timeouts are usually faster.
>
> --
> Les Mikesell
> lesmikesell at gmail.com
>
>
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