MS Outlook Authentication Box Pops Up Frequently

We have two locations that are members of our Domain.  Our headquarters location has two DC's, Tigris & Euphrates.  Our Canada location also has two DC's, SRV2 & SRV4.  Last week our Euphrates DC had to be rebuilt.  We had previously virtualized it on VMware and were noticing lots of issues.  After contacting tech support, we were adivised it was not good to perform a P2V of a DC.  MS Support advised us to rebuild it from scratch as a new VM.  We went through the process of moving it's FSMO roles off to another DC at HQ, demoting it, and then creating a new Windows 2003 Server, promoting it to a DC, and transferring the FSMO roles back to the new DC and also making it a Global Catalog server.

Since performing all of these operations, our Canada users are frequently throughout the day, like maybe 5-6 times receiving the pop-up box while they are in Exchange asking them to authenticate to exchange.  The exchange server they are using is located here at our HQ location.  Sometimes they will have to put their UserID & password in 3 times before it finally accepts it.  The local IT guy rebooted both of their DCs last night, it hadn't been done since we rebuilt the DC last week, but the reboots didn't seem to help.  Any ideas on what is causign this problem and how it can be fixed?

Thanks.
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Neptune ITAsked:
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manu4uCommented:
Did you select  INTEGRATED AUTHENTICATION

or are you using BASIC AUTHENTICATION.
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Neptune ITAuthor Commented:
In all honesty I'm not sure.  Where do I check this?  

This problem only seems to be occurring with our users in Canada who are accessing the Exchange server over the WAN.  Our local users where the exchange server is located are not experiencing this problem.

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DaMuleCommented:
Are the users having the problem connecting to Exchange using Outlook or outlook Web Access?  
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manu4uCommented:
If its when users use OWA , then you can change the authentication settings from

IIS -- > Default website --> Exchange , right click on it , go to properties  --- > directory security -- authentication ..

there u can change the authentication settings..
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Neptune ITAuthor Commented:
Users that are having the problems are all using MS Outlook 2003 client.  No OWA users have had this problem.
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manu4uCommented:
Do you have Any filter/firewall software ...

Try creating a new USER PROFILE for those guys who face problem ..
Disable/uninstall any Firewall / Filter installed in their PCs....
And check , whether this incident happens to all users at the same time or  it just comes now and then ? .


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manu4uCommented:
Additionally , if OS is windows XP, then do the following as well

1. Quit all programs.
2. Click Start, click Run, type regedt32 in the Open box, and then click OK.
3. Locate and then click the following registry key:

HKEY_CURRENT_USER\Software\Microsoft\Protected Storage System Provider
4. On the Edit menu, click Permissions.
5. Click the registry key for the user who is currently logged on. Then, make sure that the Read and Full Control permissions are both set to Allow.
6. Click Advanced. Then, verify that the user who is currently logged on is selected, that Full Control is listed in the Permissions column, and that This Key and Subkeys is listed in the Apply to column.
7. Click to select the Replace permission entries on all child objects with entries shown here that apply to child objects check box.
8. Click Apply, and then click Yes when you receive a prompt to continue.
9. Click OK two times.
10. Double-click the Protected Storage System Provider key to expand the key. Click the user subkey folder that is directly underneath the Protected Storage System Provider key, click Delete on the Edit menu, and then click Yes in the warning message dialog box.

The user subkey folder looks similar to the following example:

S-1-5-21-124525095-708259637-1543119021-16701

Note For every identity that you have, there may be a subkey under the Protected Storage System Provider key. To resolve this issue in all your identities, you must delete all the user subkeys folders that are under the Protected Storage System Provider key.

11. On the Registry menu, click Exit. Then, restart the computer.
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