RPC_S_INVALID_RPC_PROTSEQ - 1704 (0x6A8)
The RPC protocol sequence is invalid.
Updated: Feb 21, 2026
Technical Meaning
The error code RPC_S_INVALID_RPC_PROTSEQ (1704, 0x6A8) indicates that the Remote Procedure Call (RPC) protocol sequence used in a Windows API call is not valid. This can occur when an RPC client or server attempts to use an unsupported or improperly configured protocol sequence.
Error Details
This error typically arises from issues with the RPC protocol stack, which manages communication between applications and services across different machines on a network. The protocol sequence refers to the specific set of protocols that are used in conjunction to establish a connection for RPC calls.
Usage Context
The RPC_S_INVALID_RPC_PROTSEQ error can be encountered in various scenarios where RPC-based operations are performed, such as when calling remote procedures or services. It is important to note that this error does not provide specific details about the protocol sequence itself but rather indicates a failure due to an invalid configuration.
Developer Interpretation
When encountering RPC_S_INVALID_RPC_PROTSEQ, developers should consider the following:
- Verify that the RPC client and server are configured correctly with compatible protocols.
- Ensure that all required components of the RPC protocol stack are installed and functioning properly.
- Check for any recent changes or updates to the system or software that might have altered the configuration.
Related Errors
RPC_S_INVALID_BINDING(1702, 0x6A6): Indicates an invalid binding between client and server.RPC_S_CALL_FAILED(1703, 0x6A7): Suggests a failure in the RPC call itself.RPC_S_SERVER_UNAVAILABLE(1710, 0x6B2): Implies that the remote service is not available or cannot be reached.
FAQ
Q: What does RPC_S_INVALID_RPC_PROTSEQ mean?
A: It indicates an invalid RPC protocol sequence used in a Windows API call. This can occur due to incorrect configuration of the RPC stack.
Q: How can I resolve this error?
A: Ensure that all components of the RPC protocol stack are correctly configured and installed. Verify compatibility between client and server configurations.
Summary
The RPC_S_INVALID_RPC_PROTSEQ (1704, 0x6A8) error code in Windows indicates an invalid RPC protocol sequence used in a call to a remote procedure or service. Developers should focus on verifying the configuration of the RPC stack and ensuring compatibility between client and server settings.