Outlook Disconnected after resume from sleep mode

ALKSADMIN used Ask the Experts™
Hi All,

We are having some issues with our laptop users that lock their laptops while connected to the LAN and put them into sleep mode and when they re-connect to the LAN or connect through VPN they get a message saying that their connection to Exchagne is unavailable.

When i right click on the Outlook icon and go to connection status sometimes it will say that Directory is disconnected and hitting reconnect lets them back in. Other times the connection status box will be blank and when i hit reconnect it prompts for credentials but when they put in their username/password it just keeps prompting and nothing happens.

The laptops are all running windows xp with Outlook 2007 and I've verified that I can ping the exchange servers ok when the issue occurs. The users can access Lync and all their other applications but Outlook seems to be the only one affected. They are logging onto a windows 2008 R2 domain running Exchagne 2007.

This is what I've done so far:

- Verified i can ping the exchange servers
- Disabled the "Allow the computer to turn off this device to save power" power management setting on the NIC's
- Added the RPC DefConnectOpts register key and set value to 0
- Checked the event logs on the clients and exchagne servers but all clear
- Checked for event log entries to see if MAPI connection limits were been reached but all was clear
- flushed DNS  cache and ARP caches on the client

I think the issue might relate to the fact that they lock the clients and unlock when they connect back to the LAN, but I'm all out of ideas so any help is greatly appreciated.


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This is by design (correct me if I'm wrong fellow Experts) and you will have to educate users to close and reopen Outlook.

There has been solutions online to modify the CAS server authentication. But none which is tried and tested and officially supported.

Exchange 2007 / 2010 behaves differently to how it did on reconnection on Exchange 2003.
Top Expert 2012
I suspect these Laptop Users, all have docking stations for their laptops?

If they do, situation is similar to our setup
We have had to disable Hibernate, and Sleep modes on the latops to keep this from happening


Thanks guys

Hello all,
I know this question is old but I would like to challenge Netflo's assertion that this behavior is 'by design' or desired behavior.  

Netflo, can you provide a link or other information from Microsoft supporting your claim (specifically that Outlook should NOT use domain passthrough authentication when resuming from sleep or on network connectivity changes?

Microsoft released a hotfix for Outlook 2007 that to address this issue and by definition seem to indicate that it is NOT by design.  https://support.microsoft.com/en-us/kb/956531

It even appears that this can easily be bypassed.. If a user simply clicks 'cancel' on the Outlook password prompt, and then clicks the 'Need Password' text at the bottom of Outlook (2013), exchange connectivity is restored.  Keep in mind this is when NO credentials are saved for outlook.  

I'm struggling to believe that this is desired behavior.

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