Knowledge

RPC_S_INTERFACE_NOT_FOUND - 1759 (0x6DF)

The interface was not found.

Updated: Feb 21, 2026

Technical Background

The RPC_S_INTERFACE_NOT_FOUND error code is a specific error that occurs in the context of Remote Procedure Calls (RPC) within the Windows operating system. This error indicates that an attempt to call a remote procedure has failed because the specified interface could not be located.

Error Details

  • Error Name: RPC_S_INTERFACE_NOT_FOUND
  • Numeric Code: 1759
  • Hex Code: 0x6DF
  • Short Description: The interface was not found.

This error typically arises when a client application attempts to make an RPC call, but the required interface is missing or unavailable on the server side. This can happen due to various reasons such as incorrect configuration, missing components, or issues with the service hosting the interface.

Common Causes

  1. Incorrect Interface Name: The name of the interface specified in the client application does not match the actual interface name registered by the server.
  2. Missing Components: Required DLLs or other runtime components that provide the interface are missing on either the client or server side.
  3. Service Not Running: The service hosting the required interface is not running, leading to an inability to locate and use it.
  4. Configuration Issues: Incorrect configuration settings in the registry or application configuration files can lead to this error.

Real-World Context

In a typical scenario, a client application might be trying to call a remote procedure that requires a specific interface. If the server does not have this interface registered, or if the client is configured incorrectly, the RPC call will fail with this error code.

Is This Error Critical?

The criticality of this error depends on the context in which it occurs. In some cases, such as during application startup or data processing, this error can halt operations and require immediate attention. However, in other scenarios, it might be a transient issue that can be resolved by restarting services or correcting configuration.

How to Diagnose

  1. Review Operation Context: Ensure that the RPC call is being made under the correct conditions and with the appropriate parameters.
  2. Validate Parameters: Check that all required parameters are correctly specified, including the interface name.
  3. Confirm Object Types: Verify that both client and server have the necessary components to support the interface.
  4. Verify Input Data: Ensure that any input data passed to the RPC call is valid and properly formatted.
  5. Check Limits or Constraints: Confirm that there are no system limits or constraints preventing the use of the required interface.

How to Resolve

  1. Correct Parameter Usage: Double-check all parameters used in the RPC call, ensuring they match the expected values.
  2. Adjust Operation Context: Ensure that the environment and configuration settings support the required interface.
  3. Restore Data: If missing components are identified, reinstall or repair any necessary software.
  4. Retry Operation with Valid Inputs: Attempt to make the RPC call again using valid inputs and configurations.

Developer Notes

When developing applications that use RPC, it is crucial to ensure that all required interfaces are correctly registered on both client and server sides. Proper error handling should be implemented to gracefully handle this and other similar errors, providing meaningful feedback to users or logging detailed information for troubleshooting.

Related Errors

  • RPC_S_SERVER_UNAVAILABLE: The server hosting the interface could not be reached.
  • RPC_S_CALL_FAILED: The RPC call failed due to an unspecified reason.
  • RPC_S_INVALID_BINDING: The binding handle used in the RPC call is invalid.

FAQ

Q: What does the RPC_S_INTERFACE_NOT_FOUND error mean?

A: This error indicates that the specified interface could not be located during a Remote Procedure Call (RPC).

Q: How can I prevent this error from occurring?

A: Ensure that all required interfaces are correctly registered and available on both client and server sides. Validate parameters and input data, and confirm that the environment supports the necessary components.

Q: Can this error be caused by a missing DLL?

A: Yes, if a required DLL providing the interface is missing or not properly installed, this error can occur.

Summary

The RPC_S_INTERFACE_NOT_FOUND error code signifies that an RPC call could not locate the specified interface. This issue can arise from various causes such as incorrect configuration, missing components, or service availability problems. By understanding and addressing these potential issues, developers can effectively diagnose and resolve this error in their applications.