RPC_S_TYPE_ALREADY_REGISTERED - 1712 (0x6B0)

The type universal unique identifier (UUID) has already been registered.

Updated: Feb 21, 2026

Technical Meaning

The RPC_S_TYPE_ALREADY_REGISTERED error indicates that a type universal unique identifier (UUID) has already been registered in the system. This UUID is used to uniquely identify a specific data type or service within the context of Remote Procedure Call (RPC) and other Windows services.

Error Details

This error typically occurs when an attempt is made to register a UUID that has already been assigned to another data type or service. The UUID, which stands for Universal Unique Identifier, is a 128-bit number used to identify unique entities in the system. In the context of RPC and other Windows services, these UUIDs are crucial for ensuring that different components can communicate correctly without ambiguity.

Usage Context

This error can occur in various scenarios where UUID registration is required, such as when developing custom RPC services or registering data types within a Windows application. It is important to ensure that the UUID being used has not been previously registered to avoid conflicts and ensure proper system operation.

Developer Interpretation

When encountering this error, developers should verify that the UUID they are attempting to register is unique and has not already been assigned to another component in the system. This can be done by checking existing registrations or using tools provided by Windows for managing UUIDs.

Related Errors

  • RPC_S_UUID_LOCAL_ONLY (1704): Indicates that a local-only UUID was used in a context where a global UUID is required.
  • RPC_S_UUID_NO_ADDRESS (1723): Indicates that no address could be found for the specified UUID.

FAQ

Q: What does RPC_S_TYPE_ALREADY_REGISTERED mean?

A: It means that a type universal unique identifier (UUID) has already been registered in the system, preventing its re-registration.

Q: How can I resolve this error?

A: Ensure that the UUID you are attempting to register is unique and not already in use. Use tools or APIs provided by Windows to manage UUID registrations effectively.

Summary

The RPC_S_TYPE_ALREADY_REGISTERED error signifies a conflict with an existing UUID registration, which can occur during development of RPC services or other applications requiring unique identifiers. Developers should verify the uniqueness of UUIDs and use appropriate management tools to avoid this issue.