exim-4.50-1: SMTP sending fails with "Software caused connection abort"

["Steven E. Harris" <seh at panix dot com>]

[I sent this earlier this morning via gmane, but it has yet to reach
 the list. I apologize if a duplicate arrives later.]

Using a very fresh Cygwin installation with exim-4.50-1, I am unable
to send any outgoing messages over SMTP; exim's connection attempts
fail with the reported error "Software caused connection abort".

My exim.conf file is as of now unmodified from the default. Messages
destined for remote hosts are successfully resolved to the proper
router (dnslookup) and transport (remote_smtp). Running exim with
"exim -qf -d" includes the following output:

,----[ 'exim -qf -d' Output ]
| delivering IJLBTA-0002D0-O3 to mx4.mail.yahoo.com [68.142.202.11] (someone@yahoo.com)
| set_process_info:  2476 delivering IJLBTA-0002D0-O3 to mx4.mail.yahoo.com [68.142.202.11] (someone@yahoo.com)
| hosts_max_try limit reached with this host
| Connecting to mx4.mail.yahoo.com [68.142.202.11]:25 ... failed: Software caused connection abort
| LOG: MAIN
|   mx4.mail.yahoo.com [68.142.202.11]: Software caused connection abort
| set_process_info:  2476 delivering IJLBTA-0002D0-O3: just tried mx4.mail.yahoo.com [68.142.202.11] for someone@yahoo.com: result DEFER
`----

The connection fails and the outbound message is queued again for
later delivery as expected. Testing so far reveals the same behavior
for all remote hosts.

The same problem arises whether I run exim interactively or as a
daemon. When I do run exim as a daemon, I see the following entries in
exim_panic.log, each corresponding to the 10-minute queue run period:

,----
| 2005-07-14 08:27:54 daemon: fork of queue-runner process failed: Resource temporarily unavailable
`----

Searching around before posting here, I found other problem reports
with the string "Software caused connection abort" related to socket
usage with other programs on other operating systems; I did not find
any mention of exim or Cygwin.

Is this a known problem? What additional information can I provide to
help troubleshoot this problem?

-- 
Steven E. Harris

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