[ExchangeList] Re: X400 Associations

  • From: Neil Doody <Neil.Doody@xxxxxxxxxxx>
  • To: "'Monk, Joe'" <joe@xxxxxxxxxxxxxxx>
  • Date: Tue, 30 May 2006 16:25:47 +0100

http://www.msexchange.org
-------------------------------------------------------Hi, thanks for the reply.

I did already realise that there was one association kept for high priority
messages as this is documented in the MS papers I have been reading.  When
it talks about messages, I assume it means actual emails?  And to open an
association, with the default of 50 there has to be 50 emails actually
queued, that is mails not yet delivered awaiting to go over the X400 link?

See that's the problem, even when there are no mails queued to go out, more
associations are being opened and if I look at  the bytes/sec spikes, there
is no chance that mails are coming in 50 at a time.
-----Original Message-----
From: Monk, Joe [mailto:joe@xxxxxxxxxxxxxxx] 
Sent: 30 May 2006 15:31
To: Neil Doody
Subject: RE: [ExchangeList] X400 Associations

Neil,

I think your understanding of associations is a bit incorrrect. Exchange
opens 10 associations, which are fixed as "1 high priority, and 9 low
priority".

The default setting is 50 messages per association. Increasing this
number decreases the number of associations that have to be open. So, 6
should be normal (400 x 5 = 2000 low priority + 1 association for high
priority) in your case.

It might be time for another X400 connector. (Yes, you can have more
than one to the same destination). 

Good Luck.

Joe

-----Original Message-----
From: exchangelist-bounce@xxxxxxxxxxxxx
[mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of Neil Doody
Sent: Tuesday, May 30, 2006 9:03 AM
To: 'exchangelist@xxxxxxxxxxxxx'
Subject: [ExchangeList] X400 Associations

http://www.msexchange.org
-------------------------------------------------------Hi, I am having
some serious issues with our X400 link to Brussels, basically after say
a 24 hour period mails start to queue up and in the event log we see
lots of "Maximum amount of associations has been reached", the mails
continue to queue and queue until I restart the MTA and then the queue
which can be in excess of 2000 mails clears in a few minutes.

I have followed most of the MS papers on the internet for tweaking
different registry keys to do with threads and I have altered the limits
on the X400 connector to tell exchange not to open another association
until 400 messages are queued.  The strange thing is, I am lead to
believe that exchange only opens another association when the limit of
messages are queued for delivery, the default limit being 50 messages
with a fixed maximum of 10 associations, only our exchange box seems to
be opening multiple associations even with nothing queued?  Take for
instance right now I have perfmon running and there is nothing in the
queue yet I have 6 outbound associations open?  Perhaps my understanding
of the MS papers is way off but I believe this figure should be closer
to 0.

I have turned on maximum logging with a 500mb event size and there
doesn't appear to be anymore clues apart from about 3 or 4 different
event id that simply bang on about the maximum number of associations
being reached.  It seems to me that exchange is allocating associations
but not releasing them to be used again?

Any help would be much appreciated; I am running Exchange 5.5(SP4) on
windows 2000 Advanced Server(SP4) and is running in an active/passive
cluster.



Many thanks
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