Why do I receive an access-denied error when I try to access the Microsoft Management Console (MMC) Disk Management snap-in?

A. When you try to access the Disk Management MMC snap-in (by going to the Storage branch in the MMC under Start, Programs, Administrative Tools, Computer Management), you might receive the following error:

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"Access to Disk Manager on is denied.
You don't have access rights to the service."

You must be logged on as an Administrator to resolve this problem. A common cause is that the Distributed COM (DCOM) configuration for authentication might have been changed from Connect to Default. To resolve this situation, perform the following steps:

  1. Start the DCOM Configuration utility (go to Start, Run, and type dcomcnfg.exe).
  2. Select the Default Properties tab.
  3. Change the Default Authentication Level from Default to Connect and click OK.
  4. Restart the machine.
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