RPC_S_DUPLICATE_ENDPOINT - 1740 (0x6CC)
The endpoint is a duplicate.
Updated: Feb 21, 2026
Technical Meaning
The RPC_S_DUPLICATE_ENDPOINT error code indicates that an attempt was made to register or use a duplicate endpoint name in the Remote Procedure Call (RPC) system. This is a specific technical mechanism within the RPC framework, which manages communication between applications and services.
Error Details
This error typically occurs when two or more entities are trying to use the same endpoint name for an RPC service. An endpoint name uniquely identifies a service on a particular machine in the context of RPC communications. When such duplication is detected, it can lead to conflicts and failures in establishing proper communication channels.
Common Causes
- Invalid Parameter Values: The endpoint name provided during registration or usage might already be registered by another entity.
- Incorrect Object Type: The operation being performed on the endpoint might not match its intended use (e.g., attempting to bind a service to an endpoint that is already in use).
Real-World Context
In practical scenarios, this error can occur when multiple services or applications are trying to register with the same endpoint name within the RPC framework. This could happen due to misconfiguration, concurrent operations, or bugs in application code.
Is This Error Critical?
The criticality of this error depends on the context. If an application is attempting to bind a service to an already registered endpoint, it will fail, potentially leading to service unavailability or communication issues between applications that rely on RPC for inter-process communication (IPC).
How to Diagnose
To diagnose and resolve RPC_S_DUPLICATE_ENDPOINT, follow these steps:
- Review Operation Context: Ensure that the operation being performed is appropriate for the endpoint name. Verify if another service or application is using the same endpoint.
- Validate Parameters: Check the parameters passed during registration or usage to ensure they are unique and correctly formatted.
- Confirm Object Types: Confirm that the object types (e.g., service, client) match their intended use with respect to the endpoint name.
How to Resolve
To resolve this issue, take the following actions:
- Correct Parameter Usage: Ensure that all parameters used in registration or usage are unique and correctly formatted.
- Adjust Operation Context: If multiple services are attempting to use the same endpoint, adjust their operation context to avoid conflicts. This might involve changing endpoint names or reconfiguring service bindings.
Developer Notes
Developers should ensure proper management of endpoint names when implementing RPC-based applications. Use unique and well-documented endpoint names to prevent such errors. Additionally, consider implementing error handling mechanisms that can gracefully handle RPC_S_DUPLICATE_ENDPOINT and provide appropriate feedback to the user or application.
Related Errors
- RPC_S_SERVER_UNAVAILABLE: Indicates a failure in establishing a connection with an RPC service due to server unavailability.
- RPC_S_CALL_FAILED: General error indicating a failure in executing an RPC call.
FAQ
Q: What does RPC_S_DUPLICATE_ENDPOINT mean?
A: It indicates that the endpoint name being used is already registered, leading to potential conflicts in RPC communications.
Q: How can I prevent this error from occurring?
A: Ensure unique and well-documented endpoint names for each service or application. Implement proper validation logic during registration and usage of endpoints.
Q: Can this error be critical for my application?
A: Yes, if your application relies on RPC for communication, a RPC_S_DUPLICATE_ENDPOINT can lead to service unavailability or failed communications between applications.
Summary
The RPC_S_DUPLICATE_ENDPOINT error code is specific to the Remote Procedure Call (RPC) framework and indicates that an attempt was made to use a duplicate endpoint name. This can be caused by invalid parameters, incorrect object types, or concurrent operations. Proper management of endpoint names and validation logic are crucial to prevent such errors.