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 ------------------------------------------------------- List Archives: //www.freelists.org/archives/exchangelist/ MSExchange Newsletter: http://www.msexchange.org/pages/newsletter.asp MSExchange Articles and Tutorials: http://www.msexchange.org/articles_tutorials/ MSExchange Blogs: http://blogs.msexchange.org/ ------------------------------------------------------- Visit TechGenix.com for more information about our other sites: http://www.techgenix.com ------------------------------------------------------- To unsubscribe visit http://www.msexchange.org/pages/exchangelist.asp Report abuse to listadmin@xxxxxxxxxxxxxx ------------------------------------------------------- List Archives: //www.freelists.org/archives/exchangelist/ MSExchange Newsletter: http://www.msexchange.org/pages/newsletter.asp MSExchange Articles and Tutorials: http://www.msexchange.org/articles_tutorials/ MSExchange Blogs: http://blogs.msexchange.org/ ------------------------------------------------------- Visit TechGenix.com for more information about our other sites: http://www.techgenix.com ------------------------------------------------------- To unsubscribe visit http://www.msexchange.org/pages/exchangelist.asp Report abuse to listadmin@xxxxxxxxxxxxxx