Outlook Connection Issues: Event ID 26 - Connection to Microsoft Exchange has been lost.

Microsoft Outlook 2007 with SP2 is continually reconnecting to the Microsoft Exchange Server with SP1 (Update Rollup 8) on the Microsoft Windows Server 2008 Standard with SP2.

This is a new setup with freshly formatted clients and servers, with everything configured, and all the updates from Microsoft. Everything is working properly except for this one issue.

- I have tired updating the firmware and drivers for the network cards on the Dell PowerEdge 2950 server. Everything on the server is 64-bit, and the clients are mixed 32 and 64.

- I have the windows firewall on the server and clients disabled for troubleshooting of the issue. During the period while the clients are connected everything works fine in Outlook.

- It is at random, an average of every 8 minuets sometimes less sometimes more. I only see the issue from the clients perspective and not the server in event viewer.

- I don't have any other network related issues. Everything is running gigabit network and ping from <1ms to max 20ms without interruption (with ping server /t for over 20 mins.) I have other programs that are using the same server and other servers plugged into the same Dell PowerConnect 2724 switch that are not being interrupted. I have also copied very large files to and from the server without interruption.

- Outlook will also prompt some of clients for their username/password when reconnecting, even though they are logged in under their name on their computer joined to the domain. Once typing in their password it finishes the reconnect and works again for a few minuets longer.

I don't know what I am missing, but would defiantly appreciate the help.
haveacokeAsked:
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lastlostlastCommented:
check this article.... http://support.microsoft.com/kb/969519

you might need to apply this hotfix... http://support.microsoft.com/kb/961752/
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haveacokeAuthor Commented:
Remember I am running Microsoft Office 2007 with SP2, so this hotfix would already be included in SP2 and not apply to my systems. I also don't think the issue is with the clients, and that the issue will most likely be on the server.
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lastlostlastCommented:
I asked you to apply the hotfix as there are known connectivity issues with exchange server after applying SP 2 which is also mentioned in the KB article.. i.e. http://support.microsoft.com/kb/969519

"After you install either the February 24, 2009 cumulative update that is described in Microsoft Knowledge Base article 961752 or the 2007 Microsoft Office suite Service Pack 2, you may experience the following symptoms."

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haveacokeAuthor Commented:
I don't have that issue, nor do I receive either of the error messages. Also the hotfix does not apply to SP2, because it is already in SP2 as I stated. Read your own quote!
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lastlostlastCommented:
I don't see anything wrong in the quote... as mentioned it applies if Outlook 2007 is running on SP2...

also the error message in Event ID: 26 is 'Connection to the Microsoft Exchange Server has been lost. Outlook will restore the connection when possible.'

also it is not always necessary that you will get the same exact message... depends on environment to environment...

anyways... its upto you to try it out.... i have seen outlook 2007 connectivity issues post sp2 and hence suggested applying the hotfix...

Thanks
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haveacokeAuthor Commented:
I upgraded the memory in the server, and disabled one of the NICs in the server, and that resolved the issue.
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cbossertCommented:
Haveacoke,

Have you seen this happen again, since you had these problems? I too have the exact same problem happening. New Exchange server 2007 running on a Dell Poweredge 2950 III. This only seems to happen to outlook 2007 clients. I have upgraded the nic drivers and still have the same problems. One is disabled. Memory seems fine. Dell was of no help.
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