exchange 2010 content indexing and session limits.
Hi,
We're seeing occasional 9646 errors:
Log Name: Application
Source: MSExchangeIS
Date: 27/06/2012 09:57:38
Event ID: 9646
Task Category: General
Level: Error
Keywords: Classic
User: N/A
Computer: SERVER001.uk.domain.com
Description:
Mapi session "guidstuff: /o=stuff/ou=UK-Mailbox/cn=Recipients/cn=Blokey" exceeded the maximum of 32 objects of type "session".
now, they're not very often, and i know i can follow the instructions below to increase the session limit to 64, or 128.
http://technet.microsoft.com/en-us/library/ff477612.aspx
i am, however, aware of Neil Hobson's advice below that increasing the limit without understanding why is merely hiding the problem.
http://social.technet.microsoft.com/Forums/en/exchangesvrgeneral/thread/36c11ba1-e779-4ee3-bea6-6ddf07c9e2c8
I wouldn't just go changing the registry key as this is simply masking the problem. Go to the user in question and see what they're doing.
Last time we saw this it was due to the user's Outlook client having the "download shared folders" option enabled like Raj said earlier, causing shared mailbox contents being downloaded locally. Also, the other thing that often causes this is when the
user has 3rd party desktop search programs enabled, hammering the server, etc.
Neil Hobson, Exchange MVP
Now, i've read a lot of Neil's stuff and i certainly wouldn't dismiss what he has to say, so we went to check the user and.. nothing. The user doesn't have third party apps, doesn't have blackberry, isn't opening lots of shared folders. doesn't appear to
be misbehaving in any way.
so we did some more digging, and looked at get-logonstatistics. we could see 30 connections for this user into the store. 3 of them were client=MSExchangeRPC, and 27 of them were Client=CI. that seemed pretty odd, but we came across this article:
http://blogs.technet.com/b/exchangesearch/archive/2011/05/17/get-logonstatistics-shows-logons-to-a-mailbox-on-the-active-node-by-the-exchange-search-indexer-on-the-passive-node-s-of-a-dag-in-exchange-2010.aspx
which explains perfectly why Content Indexing makes connections into the store, and why they are under the user's logon, but it leaves these two questions unanswered:
1. why are there so many connections made by Content Indexing?
2. Do these connections count toward the user's session limit?
July 31st, 2012 7:20am
Hi
why are there so many connections made by Content Indexing?
It is hard to say. Does it affect on one user or all users ? multi-mailbox search\add-in app will cause this kind of problem.
Maybe you can reseed the Search Catalog?
http://technet.microsoft.com/en-us/library/ee633475.aspx
Do these connections count toward the user's session limit?
According to your saying, it is the reason.Terence Yu
TechNet Community Support
Free Windows Admin Tool Kit Click here and download it now
July 31st, 2012 11:19pm
Hi
why are there so many connections made by Content Indexing?
It is hard to say. Does it affect on one user or all users ? multi-mailbox search\add-in app will cause this kind of problem.
Maybe you can reseed the Search Catalog?
http://technet.microsoft.com/en-us/library/ee633475.aspx
Do these connections count toward the user's session limit?
According to your saying, it is the reason.Terence Yu
TechNet Community Support
July 31st, 2012 11:25pm