On Fri, Oct 31, 2008 at 07:42:59PM -0400, Vintinner, M. Scott wrote:
> When their servers are experiencing an "outage" , I see:
>
> Oct 28 09:24:41 mta1 postfix/smtp[24419]: connect to
> wec-imail1.bank.com[xxx.xxx.91.91]: Connection refused (port 25)
Connection refused is not what you would expect with overload of the
remote server, rather you would expect connection timeouts. Some Windows
servers have been reported to return "connection refused" under high
load, but this does not look like an Exchange server:
smtp-finger: Connected to wec-imail1.wachovia.com[169.200.91.91]:25
smtp-finger: < 220 wec-imail1.wachovia.com ESMTP Ready.
smtp-finger: > EHLO hqmtaint02.ms.com
smtp-finger: < 250-wec-imail1.wachovia.com Hello hqmtaint02.ms.com
[205.228.53.69], pleased to meet you
smtp-finger: < 250-ENHANCEDSTATUSCODES
smtp-finger: < 250-PIPELINING
smtp-finger: < 250-8BITMIME
smtp-finger: < 250-SIZE 36700160
smtp-finger: < 250-DSN
smtp-finger: < 250-AUTH DIGEST-MD5 CRAM-MD5
smtp-finger: < 250-STARTTLS
smtp-finger: < 250-DELIVERBY
smtp-finger: < 250 HELP
Anyone recognize the MTA in question by the form of its EHLO response?
Apart from the banner, it looks a bit like Sendmail (HELP and DELIVERBY).
Connection refused is more typical of traffic shaping firewalls in front
of the MTA. And in that case, you may need to get on Wachovia's whitelist.
--
Viktor.
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