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Outlook getting disconnected from exchange due to user execeded max no of MAPI connections

Posted on 2007-03-29
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Hi,

Outlook 2003 SP2 connected to exchange 2003 SP2. A user is getting disconnected from exchange saying the user execeded max no of MAPI connections. Event viewer i can see event 9646 with writing

Mapi session "/o=First Organization/ou=First Administrative Group/cn=Recipients/cn=user" exceeded the maximum of 32 objects of type "session".

Ive seen MS KB 842022, 830829 and some other KBs realted to same error. Saw http://forums.msexchange.org/m_200018000/mpage_1/tm.htm as well as
http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_22086814.html?sfQueryTermInfo=1+32+exceed+maximum+object+session+type#a18391242

All saying the same. The only thing i didnt try was increasing the max no of sessiong in reg as per KB.

The main reason is i saw other users saying after increasing sessions value also they getting the same error. Anyone have a solution for this.

Thanks

Qman

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Question by:qman2007
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Expert Comment

by:Sembee
ID: 18818471
Very unusual to see this error, so I would start looking for other causes.
Do you have other things accessing the mailboxes? Blackberry, Windows Mobile, third party applications etc?

It could also be an indication of poor connectivity to the Exchange server, with sessions being frequently broken.

Simon.
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Author Comment

by:qman2007
ID: 18821947
Simon,

Thanks for ur reply. Only one user is facing this problem right now. This user is in the same LAN as my exchange server and the user is on a wireless connection. This user is not using any Blackberry or mobile device or anything of that sort. In my LAN i have so many users connected through wireless. Do you think connected over wireless can cause a problem? Ive observered another problem in same LAN.

There are some users in LAN who are connected to exchange server as POP3 clients through wireless. Sometimes when they are trying to send mails of some 1 MB and more the connection keeps on time out and sometimes it goes very fast. What i do is i close outlook and open again. Sometimes when i close and open it goes fast. When it gets time out, if i open OWA and try to send mail it goes really fast. Like i can send even 4 MB file also within no time. The wireless connection is showing as excellent all the times.

Even my exchange and AD, GCA all are in same LAN connected over Gigabit port through Switch. Do you think there is some relation between this problem and the one i mentioned before?

Please help me. Let me know if you need any more information.

Thanks in advance.

Qman
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Sembee earned 500 total points
ID: 18822433
Considering what you have said above, I would begin to suspect the wireless. If only one user is seeing the problem then perhaps connecting them to a wired link for a while would be a good test to see if the problem goes away.
If you are having connection and traffic issues with the wireless network then you may need to get it looked at, to see whether there is a problem with the configuration of the wireless network.

Simon.
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Author Comment

by:qman2007
ID: 18823070
Simon,

Thanks again. So you suspecing wireless connection for my both problems? (POP 3 clients sending issue as well as MAPI excedded problem|) Do u think anything on the server side i should look?

 For the MAPI sessions exceded user one thing i observed is, MSN Live Messenger is running. Do u think it can create this MAPI sessions?

Thanks.

Qman
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Expert Comment

by:Sembee
ID: 18826175
MSN Messenger doesn't connect to Exchange, although it does interact with Outlook. However I run messenger on my own machines and don't see any MAPI errors.

Considering you have issues with both POP3/SMTP and MAPI I would be looking outside of Exchange. A wired connection would be the quickest way of showing of the issue is with the wireless or not.

Simon.
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Author Comment

by:qman2007
ID: 18965217
Simon,

Thanks for your help and iam accepting your suggestion regarding wireless as the answer. After moving the user to cable there was no problem. But i dont think there is anything wrong with Wireless Configuration. Normal browsing and all are very fine as well as wireless connection shows "Excellent" status.

Anyways, do you have any suggestion to check in wireless configuration?

Thanks

Qman
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Expert Comment

by:Sembee
ID: 18966688
I have seen so many problems with wireless that just "go away" after time or after a reinstall of the wireless network drivers. Very difficult to troubleshoot, particularly if other areas work correctly.

Simon.
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Author Comment

by:qman2007
ID: 18971515
Simon,

Many thanks for all your help.

Qman
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