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)

此時點選新增角色,會出現以下error

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.