Domain Controller keeps Restarting Randomly

Domain Controller keeps Restarting Randomly

I have Windows Domain Controller 2008, that keeps restarting randomly. when I checked the system log, I found this :

The process wininit.exe has initiated the restart of computer MYDC04 on behalf of user  for the following reason: No title for this reason could be found
 Reason Code: 0x50006
 Shutdown Type: restart
 Comment: The system process 'C:\Windows\system32\lsass.exe' terminated unexpectedly with status code 255.  The system will now shut down and restart.



This is Physical server, I checked it and did not see any apparent hardware issue, no amber or red lights.

I checked if there is any scheduled task and could not find one.

I really cannot pinpoint the root cause.

Any help will be very much appreciated.

Thanks



System Manufacturer:       Dell Inc.
System Model:              PowerEdge 1950
OS Name:                   Microsoft Windows Server 2008 R2 Standard
OS Version:                6.1.7601 Service Pack 1 Build 7601
jskfanAsked:
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David Johnson, CD, MVPOwnerCommented:
There is a hot fix available http://support.microsoft.com/kb/2732595/en-US
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Manjunath SulladTechnical ConsultantCommented:
Yes, You need to follow David guidelines,

In our environment, we too faced this issue, After installing hotfix this issue has been resolved completely,
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jskfanAuthor Commented:
I downloaded Update for Windows Server 2008 R2 x64 Edition (KB2749655)

when I tried to install it , it says it is already installed.


This is my OS:
OS Name:                   Microsoft Windows Server 2008 R2 Standard
OS Version:                6.1.7601 Service Pack 1 Build 7601
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jskfanAuthor Commented:
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jskfanAuthor Commented:
Have downloaded it from the link above:
Installation Successful: Windows successfully installed the following update: Hotfix for Windows (KB2732595)
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jskfanAuthor Commented:
The hotfix did not help...

The DC keeps shutting down again....

Any idea?
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Manjunath SulladTechnical ConsultantCommented:
Try to analyze the crash memory dump,
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jskfanAuthor Commented:
I have updated server firmware..so far it is not restarting by itself
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jskfanAuthor Commented:
Thanks
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