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Outlook prompting for password after opening ?

People,

in my Exchange Server 2010 SP2 environment below:

PRODHT-CAS01 (HT-CAS Server NLB node 1)
PRODHT-CAS02 (HT-CAS Server NLB node 2)

PRODMBX01 (Stand alone Mailbox Server 1) no DAG
PRODMBX02 (Stand alone Mailbox Server 2) no DAG


I'm having a problem with the Outlook 2010 in my company all in a sudden prompting for a password when the first time user open up their outlook ?

some users able to be resolve the issue by retype the AD login & password but some are not able to ?
testing using Outlook Web Access everything working fine with no issue, even after resetting the password, the problem still exist.

one thing that I notice is that the PRODHT-CAS01 cpu is running at 100% ?

HT-CAS task manager
any help and assistance would be greatly appreciated.
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Senior IT System Engineer
Asked:
Senior IT System Engineer
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2 Solutions
 
Rezwan IslamSystems AdministratorCommented:
Are these physical servers or virtual? How many CPUs you have per servers?
On a side note, have you checked any of you domain controllers for flat CPU?
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Senior IT System EngineerIT ProfessionalAuthor Commented:
They are all Virtual machines.

no all of the DC/GC are all online. the workaround was to shutdown the VM and add one more vCPU to PRODHT-CAS01, but then PRODHT-CAS02 started to go crazy with the vCPu maxing out ?
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Senior IT System EngineerIT ProfessionalAuthor Commented:
OK, one of the culprit that i've found so far is this: https://support.microsoft.com/kb/2854376 so  I guess it may because of that reason.
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Daniel AdlerCommented:
In this case all to do is to install the following update.
KB2854376
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Senior IT System EngineerIT ProfessionalAuthor Commented:
Thanks !
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