I'm running Exchange 2K3SP2 (on Win2K3R2SP2) with 20 Outlook 2K3 clients. Several clients (random/no pattern which client) keep on disconnecting and reconnecting to exchange mailbox store (without login out of the old connections). Eventually, exchange runs out of connections (currently set to 100) and would not allow users to reconnect. The error message on the Exchange server is EventID 9646. On the workstations, the EventID 26 is reported.

A few things for you to review since this could be many things. 1st thing I look at is if this all worked fine for some time without error then WHAT CHANGED? Product updates, new products etc? Are you running a Blackberry server or anything else that links into Exchange Anyone running across a VPN Any users decide to add some handy dandy new outlook add in? If none of the above, check out these articles http://support.microsoft.com/kb/830836 http://social.technet.microsoft.com/Forums/en-US/exchangesvrgeneral/thread/606d3304-abba-4f6e-a778-0dd59cb41358 http://msexchangeteam.com/archive/2007/07/18/446400.aspxTroy Werelius www.Lucid8.com

On Tue, 26 Oct 2010 00:03:08 +0000, Tom Hoang wrote: >I'm running Exchange 2K3SP2 (on Win2K3R2SP2) with 20 Outlook 2K3 clients. Several clients (random/no pattern which client) keep on disconnecting and reconnecting to exchange mailbox store (without login out of the old connections). Eventually, exchange runs out of connections (currently set to 100) and would not allow users to reconnect. The error message on the Exchange server is EventID 9646. On the workstations, the EventID 26 is reported. You can set the duration of the tcp KeepAliveTime (the keepalive packets aren't sent by default) to the recommended five minutes. http://support.microsoft.com/kb/315669 If you have users that use WiFi and move around, disconnecting and connecting to different APs this can be a real problem. --- Rich Matheisen MCSE+I, Exchange MVP --- Rich Matheisen MCSE+I, Exchange MVP

Since this problem surfaced across random PC (some locally, some across the VPN) and without any apparent patern, I'm thinking there's something going on with WindowsXP or Outlook 2K3 that's causing Outlook to constantly disconnecting from the server w/o acknowledging the disconnect and thereby closing out of the MAPI session. What do you think?Tom Hoang

Could be, did you check out Riches post and execute to see if it helps , i.e. You can set the duration of the TCP KeepAliveTime (the keepalive packets aren't sent by default) to the recommended five minutes. http://support.microsoft.com/kb/315669Troy Werelius www.Lucid8.com

On Wed, 27 Oct 2010 17:57:45 +0000, Tom Hoang wrote: > > >Since this problem surfaced across random PC (some locally, some across the VPN) and without any apparent patern, I'm thinking there's something going on with WindowsXP or Outlook 2K3 that's causing Outlook to constantly disconnecting from the server w/o acknowledging the disconnect and thereby closing out of the MAPI session. What do you think? It's probably more of a connectivity problem. Have you check to see if the switches are reporting lots of dropped packets, mismatched speed/duplex/autoconfiguration problems, etc? --- Rich Matheisen MCSE+I, Exchange MVP --- Rich Matheisen MCSE+I, Exchange MVP