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Windows Server 2008 伺服器管理員角色及功能無法開啟

Windows Svr 2008 伺服器管理員角色及功能無法開啟:
Found errors - Cannot open an anonymous level security token. (Exception from HRESULT: 0x80070543)

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此時點選新增角色,會出現以下error

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說明與方法

Followed a lead and checked the DCOM permissions on the server.

Enter the Dcomcnfg to open the Components Service  console from Run
Under Default Properties tab - Checked Enable DCOM on this computer.
Under this seleceted Default Authentication Level to Connect.
Under Default Impersonation Level set it to Identify.
Stopped and restarted the MSDTC service.