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Outlook prompt for username and password on MS Exchange 2010 DAG & CAS Servers

I have 2 Exchange 2010 DAG servers and 1 CAS/HUB role on single server on windows 2008  Server and Windows 2008 Domain infrastructure. Users on my network using Outlook MAPI client for emails. Some of users in the network gets username and password prompt everyday. If user open the outlook first time, their is no password prompt. But it suddenly occurs while outlook is running.  I search for the solution, but there is nothing on exchange 2010. The same problem occurs on one of another exchange 2010 DAG servers running on different domain and different LAN. I think their is an issue on exchange 2010 for password prompt. Please help me to resolve this. Thanks
Regards, Shahzeb Asif
1 Solution
Hendrik WieseInformation Security ManagerCommented:
Hi, Exchange uses integrated authentication so that will only happen if the users account is locked or otherwise not accessible.

Scan your network and ensure that you don't have any viruses causing the issue, also check any additional applications on the users machines that might try to use their credentials for some reason and either remove the applications or ensure that the username and password that the applications use, are correct.

Let me know if this helps.
Hendrik WieseInformation Security ManagerCommented:
Another thought is that on slow network connections outlook falls back to connecting over http

Verify this is not set by looking into the settings of the account in outlook - look in more settings and under connection "connect to microsoft exchage over http" must be unchecked

The only reason you will be receiving a username password prompt is when outlook falls back to negotiating with xchange over the web service.

hope this helps
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Hendrik WieseInformation Security ManagerCommented:
Or you could try the following and let me know if it worked:
shahzebasifAuthor Commented:
I have tried all the options but still there is no luck. For one of the user's outlook, I have changed the logon network security settings to Password Authentication NTLM. I leave this client and will see the result tomorrow. If anybody have any other suggestion, please share with me. Thanks
shahzebasifAuthor Commented:
Can anyone response to my question. The problem is not resolve yet. Any other solution? thanks
shahzebasifAuthor Commented:
Dear All,
The problem is resolved now. I would like to share this with you all. It was related to Outlook Anywhere configuration. Actually some of my client's  outlook was configured using autodiscovery feature locally on network and Exchange proxy was automatically configured using exchange 2010 settigs for outlook anywhere. My Exchange 2010 Outlook Anywhere was configured with Basic Authentication. This was the only cause for password prompt. For testing I tried to restart MS Exchange RPC service, as it restart, the user gets password prompt. To resolve this issue, I changed my Outlook Anywhere Authentication Settings from Basic to NTLM Authentication and reconfirgured outlook client's exchange proxy settings to use NTLM. After this I never gets password prompt for any user. I think there is some issue with Basic Authentication on Outlook Anywhere Settings in Exchange 2010. Thanks

Khurram Khan
Please Check with your IIS Settings for SSL Certificate. By default, it is configured as Ignore Certificate in IIS, Try to change the settings to Accept Certificate and check if outlook or OWA is prompting for username and password.
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