The authorization service is unknown.

Details
Product: Windows Operating System
Event ID: 1750
Source: RPC
Version: 5.0
Component: System Resources
Symbolic Name: RPC_S_UNKNOWN_AUTHZ_SERVICE
Message: The authorization service is unknown.
   
Explanation

In a distributed (RPC) application, either the client or server attempted to set authentication and authorization information for the binding between the client and server. However, the authentication service named by the application client or server is unknown to Windows 2000.

   
User Action

Contact the supplier of the running distributed application.

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