Fixing Win32 Error 0x000006C7 (RPC_S_NO_ENTRY_NAME)

The error code 0x000006C7 translates to RPC_S_NO_ENTRY_NAME. This error message indicates that the RPC client attempted to use a binding handle that doesn’t have an associated entry name in the name service database.

Understanding Binding Handles and Names:

• In RPC communication, binding handles are used to manage connections to remote servers.
• These handles encapsulate details like the server address, protocol, and security settings.
• In some cases, binding handles are obtained by looking up server entries in a name service database (like the Windows registry). These entries include the server’s identifier and potentially a human-readable name.

Reasons Behind RPC_S_NO_ENTRY_NAME:

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

• Incorrect Binding Handle: The client code might be using a binding handle that was not obtained from a name service lookup. This type of handle typically wouldn’t have an associated entry name.
• Name Service Issue (less common): In rare cases, if the name service database is corrupted or inaccessible, attempts to look up server entries and obtain binding handles with entry names might fail.

Resolving RPC_S_NO_ENTRY_NAME:

1. Verify Binding Handle Creation:

   • Examine how the binding handle being used is created in the client code. Ensure it’s obtained through a name service lookup function (e.g., RpcNsBindingLookupNext) that retrieves a handle with an associated entry name.

2. Consult Program Documentation:

   • Refer to the documentation for the program or service you’re trying to access remotely. It might specify the recommended way to obtain binding handles for RPC calls.

3. Review RPC Configuration Tools (if applicable):

   • If you’re using tools or libraries for RPC development, consult their documentation on creating binding handles and using name service lookups.

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 how to properly obtain binding handles for their software.

5. Name Service Troubleshooting (advanced):

   • In advanced troubleshooting scenarios, if you suspect a name service issue, consult Windows documentation or support resources for troubleshooting the name service database.

Additional Tips:

• Some RPC development environments or tools might offer functionalities to display details about binding handles, including whether they have associated entry names.
• Debuggers or logging mechanisms can help capture details about how binding handles are created and used in the client code, identifying if they lack entry names.

By understanding the role of binding handles, entry names, and name service lookups in RPC, you can identify the cause of the missing entry name. Verifying binding handle creation, consulting program documentation, reviewing RPC configuration tools (if applicable), contacting software vendor support, and troubleshooting the name service (advanced) can help address this error.