Outlook Disconnecting Frequently


Outlook Disconnecting Frequently

Hello ,

I will describe one of the problems that i got couple of years ago ,

On a server that is running Microsoft Exchange Server 2007 and windows server 2003 SP2, an event that
resembles the following event is logged in the Application log:

Event Type: Error
Event Source: MSExchangeIS
Event Category: General
Event ID: 9646
Closing Mapi session “/o=Organization/ou=Administrative
Group/cn=Recipients/cn=Recipient” because it exceeded the maximum of 32
objects of type “session”.

All MAPI client Getting Disconnting frequently/ Offline/ not connecting to Exchange server .

This problem may occur if a MAPI client opens more than the default value of the server objects.

This error is common and may have many fixes to it .

There is three common ways to fix it :

1) Windows 2003 SP2 introduced a feature called scalable networking. Disabling it immediately fixed the problem of Outlook clients using too many sessions. To disable without rebooting enter the following at a command prompt:

netsh int ip set chimney diabled

To permanently disable (reboot required), set the following registry value to 0:

2) Look at Exchange System Manager/Servers/<server>/<storage group>/<mailbox store>/logons. Visually find the user name (if this name is not known from log, as it was in my case) which exceeded 32 sessions. It is a pity that there is no way of using ESM to close these sessions. To do this, find the user’s IP address, open tcpview.exe (from Sysinternals) and close all connections to store.exe generated by that IP.
Errors with exceeded “sessions” were generated after the user tried to send a large e-mail and were caused by broken network cable on user’s workstation.

3) Use that KB that posted by MS:


That link may help you too … (its about exchange 2003 but its the same +/- :))) ) 🙂