RPC_S_INTERNAL_ERROR - 1766 (0x6E6)
An internal error occurred in a remote procedure call (RPC).
Updated: Feb 21, 2026
Technical Meaning
The error code RPC_S_INTERNAL_ERROR (1766, 0x6E6) is returned by the Remote Procedure Call (RPC) system when an internal error occurs. This indicates that a problem has occurred within the RPC subsystem itself, rather than in user-level code or external resources.
Error Details
This error typically signifies that the RPC service encountered an unexpected condition during its operation. The specific cause of this error is not detailed and can vary depending on the internal state of the RPC system at the time of the failure.
Usage Context
RPC_S_INTERNAL_ERROR is commonly used in scenarios where a client or server application makes an RPC call, and the RPC service encounters an issue that it cannot handle gracefully. This error may be returned by various RPC-related functions such as IRpcChannelBuffer::Receive, IRpcStubBuffer::Invoke, or other RPC-specific APIs.
Developer Interpretation
When this error is encountered, developers should treat it as a generic indication of an internal failure within the RPC subsystem. The exact cause may not be immediately apparent from this error alone and could require further investigation into the specific context in which the call was made.
Common Causes
- Invalid parameter values or types
- Incorrect object type handling
- Exceeding system limits or capacity constraints
- Corruption of internal data structures
- Unsupported operations within the RPC framework
Related Errors
RPC_S_CALL_FAILED(1765, 0x6E5): Indicates that a call to an RPC service failed.RPC_S_INVALID_BINDING(1798, 0x72A): Occurs when the binding handle is invalid or has been closed.RPC_S_CALL_FAILED_DNE(1764, 0x6E4): The remote object does not exist and cannot be called.
FAQ
Q: What does RPC_S_INTERNAL_ERROR mean?
A: It indicates an internal error in the RPC subsystem. Further investigation is required to determine the exact cause.
Q: How can I troubleshoot this issue?
A: Review the operation context, validate parameters, and ensure correct object types are being used.
Summary
RPC_S_INTERNAL_ERROR (1766) is a generic error code indicating an internal failure within the RPC subsystem. Developers should treat it as a signal to investigate further into the specific context of the call that generated this error.