Fixing Win32 Error 0x000006C6 (RPC_S_INVALID_BOUND)

The error code 0x000006C6 translates to RPC_S_INVALID_BOUND. This error message indicates that an issue occurred related to invalid array bounds during the RPC call.

Understanding Array Bounds:

• In RPC communication, arrays are data structures that can hold a collection of elements of the same data type.
• Array bounds define the valid range of indices that can be used to access elements within the array.
• The RPC_S_INVALID_BOUND error occurs when the client attempts to access an element outside the valid bounds of an array being sent or received in the RPC call.

Reasons Behind RPC_S_INVALID_BOUND:

There are a couple of reasons why you might encounter this error:

• Client-Side Code Issue: The client code might be using an invalid index to access an element within an array being sent to the server. This could be due to a programming error or incorrect calculations.
• Server-Side Code Issue (less common): In rare cases, the server-side code might be mishandling received arrays with invalid bounds, leading to this error.
• Data Corruption (rare): Data corruption during transmission can potentially lead to garbled data and might manifest as invalid bounds information for arrays.

Resolving RPC_S_INVALID_BOUND:

1. Review Client-Side Code:

   • Examine the client-side code responsible for marshalling data and making the RPC call. Focus particularly on how arrays are being accessed and ensure the code uses valid indices within the array bounds.

2. Verify Data Marshalling (if applicable):

   • If you have control over data marshalling code, ensure it correctly handles array dimensions and bounds information when preparing data for transmission.

3. Consult Program Documentation:

   • Refer to the documentation for the program or service you’re trying to access remotely. It might specify requirements or expectations for array usage in RPC calls.

4. Software Vendor Support:

   • If the issue persists, consider contacting the software vendor’s support for the program or service. They might have insights into specific requirements for array usage or troubleshooting steps for their software.

5. Network Traffic Analysis (advanced):

   • In advanced troubleshooting scenarios, tools like network protocol analyzers can be used to capture RPC traffic and examine the contents of data packets, including array bounds information. This can help identify inconsistencies between client and server expectations.

Additional Tips:

• Some RPC development libraries or frameworks might offer functionalities for validating array bounds during data marshalling.
• Use debuggers or logging mechanisms to capture details about the arrays being sent or received in the RPC call and any error messages related to invalid bounds.

By understanding the concept of array bounds in RPC and the reasons behind the RPC_S_INVALID_BOUND error, you can identify the cause of the issue. Reviewing client-side code, verifying data marshalling (if applicable), consulting program documentation, contacting software vendor support, analyzing network traffic (advanced), and utilizing RPC development tools for validation can help address this error.