collect I/O error on connection..resource temporarily unavailable

[Brendon Rowland]

Thanks in advance.....

I'm running Sendmail 8.8.8+Sun/8.8.8 on a Sun SparcStation 20 running
Solaris 2.5.1 and my syslog shows a number of these errors:

collect: I/O error on connection from <dialup user host name>,
from=<email
address of user>: Resource temporarily unavailable.

I'm also seeing very poor mail performance with dialup users reporting
that
they time out frequently when sending and collecting mail (using qpopper

running in "server-mode" as pop daemon).

What does this error mean, and will the above error be part of the
problem???

Thanks.....

Brendon Rowland (mailto: brow...@webtime.com.au)
National IT Manager
Webtime P/L
Ph: 03 9429 5888
Fax: 03 9429 3600

[Andrzej Filip]

RTFM :-)
http://www.sendmail.org/faq/
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http://www.sendmail.org/faq/section3.html#3.10
3.10 How do I solve "collect: I/O error on connection" or "reply: read error
from host.name" errors?

Date: April 8, 1997
Updated: June 4, 1998

There is nothing wrong. This is just a diagnosis of a condition that had not
been diagnosed before. If you are getting a lot
of these from a single host, there is probably some incompatibility between
8.x and that host. If you get a lot of them in
general, you may have network problems that are causing connections to get
reset.

Note that this problem is sometimes caused by incompatible values of the MTU
(Maximum Transmission Unit) size on a
SLIP or PPP connection. Be sure that your MTU size is configured to be the
same value as what your ISP has
configured for your connection. If you are still having problems, then have
your ISP configure your MTU size for 1500
(the maximum value), and you configure your MTU size similarly.

Although it seems like a problem of this sort would affect all of your
connections, that is not the case. You may
encounter this problem with only a small number of sites with which you
exchange mail, and it may even affect only
certain size messages.
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