Path: utzoo!attcan!uunet!mcvax!enea!kth!luth!eru.mt.luth.se!sow
From: sow@eru.mt.luth.se (Sven-Ove Westberg)
Newsgroups: comp.mail.sendmail
Subject: Re: Problems with sendmail, name service, and yellow pages
Message-ID: <1280@luth.luth.se>
Date: 16 Nov 88 11:40:59 GMT
References: <1070@cps3xx.UUCP>
Sender: news@sm.luth.se
Reply-To: Sven-Ove Westberg <sow@eru.luth.se>
Organization: University of Lulea, Sweden
Lines: 37
UUCP-Path: {uunet,mcvax}!enea!eru.luth.se!sow

In article <1070@cps3xx.UUCP> rang@cpswh.cps.msu.edu (Anton Rang) writes:
|Every once in a while I see the following scenario:
|
|  1.  Mail is sent to some user (user@host.domain.domain).
|  2.  Sendmail appears to hang for a while, way down in yp_match (I think).
|  3.  Eventually, it times out (or something).  The message bounces, with
|      the error "Deferred: address already in use" (or something like that.)
|
|At this point, the message will go through if I try sending it again,
|presumably because the information is now sitting in the local name
|service cache.  I assume there is some sort of timing (?) problem.
|
|  Can anyone explain this?  Even better, is there a fix?  I'm using
|Sendmail 5.59 and Bind 4.8 (SunOS 3.4, YPSERV patch from Sun).

This is a known feature in the sun ypserv. I have reported it to
hotline here in Sweden unfortunately they haven't find a fix yet.
The problem is that if all name-servers for a region is unreachable
for som reason. Then the ypserv tries forever. You can test it
if you know a region without any servers. 

1) Start debug on the nameserver.
2) Try to rlogin, telnet ... to an address in this region.
3) Look at the debug trace from the nameserver.

This will never happen on a REAL unix eg bsd4.3 and if it had this
kind of terrible bugs Berkeley would have sent out a fix promptly.

Did Sun or some else have a fix to this problem???


Sven-Ove Westberg, CAD, University of Lulea, S-951 87 Lulea, Sweden.
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