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From: dorner@pequod.cso.uiuc.edu (Steve Dorner)
Newsgroups: comp.sys.mac.comm
Subject: Re: Eudora POP mail client and A/UX 2.0
Message-ID: <1991Mar13.223450.20337@ux1.cso.uiuc.edu>
Date: 13 Mar 91 22:34:50 GMT
References: <31174@shamash.cdc.com> <27DE8919.1A30@intercon.com>
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Organization: University of Illinois at U-C
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>> After clicking OK, Eudora tries to QUIT the connection with the SMTP
>> server but it times out after 20 seconds.
>We have run into some problems with MacTCP not closing connections when being 
>run in the Mac partion of A/UX.

There is some sort of BAD THING happening around connection closure.  I find
that 3com's EtherLink SE board exhibits similar (but not identical) symptoms
under MacOS.

A race condition seems to exist sometime during the Close/Receive/Release
process; if you slow it down (by tracing with a debugger, for example)
the problem goes away.  (Fun, fun, fun to debug.)

I also find that the exact same calling sequence and timing works with some
services, but not others.  SMTP seems to be a problem, whereas POP3 is not.
It may have something to do with the order in which the final dance is
done by the various servers.

I think the answer is going to involve packet dumps and analysis (yuck),
unless someone who knows would like to pipe up.  I hate to point fingers,
and it may indeed be my fault, but I *think* this is a bug with a big Apple painted on its back.
--
Steve Dorner, U of Illinois Computing Services Office
Internet: s-dorner@uiuc.edu  UUCP: uunet!uiucuxc!uiuc.edu!s-dorner