Knowledge

RPC_S_INVALID_NAME_SYNTAX - 1736 (0x6C8)

The name syntax is invalid.

Updated: Feb 21, 2026

Technical Background

The RPC_S_INVALID_NAME_SYNTAX error code is a specific error that indicates an issue with the syntax of a name passed to a Remote Procedure Call (RPC) service. This error typically arises when the input string does not conform to the expected format or structure required by the RPC service.

Error Details

The RPC_S_INVALID_NAME_SYNTAX error code is returned by the Windows API when an invalid name syntax is detected during the execution of a Remote Procedure Call (RPC) operation. This can occur in various scenarios, such as when attempting to bind to a remote procedure or when passing a parameter that contains an improperly formatted name.

Common Causes

  • Invalid Parameter Values: The input string does not adhere to the expected format for the RPC service being used.
  • Incorrect Object Type: The object type specified in the name is not recognized by the RPC service, leading to syntax validation failure.
  • Exceeding Limits: The length or complexity of the name exceeds the maximum allowed by the RPC service.

Real-World Context

This error can occur when working with distributed applications that rely on RPC services for communication. For example, it might be encountered when attempting to register a remote procedure or when passing an invalid name in a method call within an RPC-based application.

Is This Error Critical?

The criticality of this error depends on the specific context and the impact on the application. In most cases, it is not a critical issue that would cause system instability but rather indicates a need for parameter validation or correction.

How to Diagnose

To diagnose the RPC_S_INVALID_NAME_SYNTAX error, follow these steps:

  1. Review Operation Context: Ensure that the operation context and parameters are correct.
  2. Validate Parameters: Check the input string for any syntax errors or invalid characters.
  3. Confirm Object Types: Verify that the object types specified in the name are recognized by the RPC service.
  4. Verify Input Data: Ensure that the length and complexity of the name do not exceed the maximum allowed by the RPC service.

How to Resolve

To resolve this error, take the following actions:

  • Correct any invalid parameter values or syntax errors in the input string.
  • Adjust the operation context if necessary.
  • Restore data if it has been corrupted.
  • Retry the operation with valid inputs.

Developer Notes

When working with RPC services, always ensure that the names passed to methods are correctly formatted and adhere to the expected syntax. This can be achieved by validating input parameters before making RPC calls or by using predefined constants for object types where applicable.

Related Errors

  • RPC_S_INVALID_BINDING: Indicates an invalid binding context.
  • RPC_S_NAME_NOT_FOUND: The specified name was not found in the directory service.
  • RPC_S_CALL_FAILED: The call to the remote procedure failed due to other reasons.

FAQ

Q: What does RPC_S_INVALID_NAME_SYNTAX mean?

A: It indicates that a name passed to an RPC operation is invalid or improperly formatted.

Q: How can I prevent this error from occurring?

A: Validate input parameters and ensure they conform to the expected syntax before making RPC calls.

Summary

The RPC_S_INVALID_NAME_SYNTAX error code is specific to issues with name syntax in Remote Procedure Call (RPC) operations. It indicates that a passed name does not meet the required format or structure, leading to an invalid operation. By validating input parameters and ensuring correct usage of object types, developers can prevent this error from occurring.