Fixing Win32 Error 0x000006CB (RPC_S_UUID_NO_ADDRESS)

The error code 0x000006CB translates to RPC_S_UUID_NO_ADDRESS. This error message indicates that the RPC call failed because the client couldn’t locate a network address for the server identified by its Universally Unique Identifier (UUID).

Understanding UUIDs and Network Addresses:

• In RPC communication, servers can be identified using UUIDs, which are globally unique identifiers.
• However, to establish a connection, the client needs the server’s network address (e.g., IP address).
• The RPC_S_UUID_NO_ADDRESS error occurs when the client has the server’s UUID but cannot find its corresponding network address for communication.

Reasons Behind RPC_S_UUID_NO_ADDRESS:

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

• Missing or Incorrect Server Registration: The server might not be correctly registered in a name service (like Windows registry) that maps UUIDs to network addresses.
• Outdated Client Information: The client might be using outdated information about the server’s network address, which no longer corresponds to the server’s current location.
• Dynamic Network Environments (less common): In dynamic network environments where IP addresses are assigned automatically, the client might have difficulty keeping track of the server’s current address.

Resolving RPC_S_UUID_NO_ADDRESS:

1. Verify Server Registration:

   • If you have access to server administration, ensure the server is properly registered in a name service like the Windows registry. This registration should associate the server’s UUID with its current network address.

2. Consult Program Documentation:

   • Refer to the documentation for the program or service you’re trying to access remotely. It might specify how to obtain the server’s network address or provide alternative connection methods that don’t rely solely on UUIDs.

3. Clear Client Cache (if applicable):

   • In some cases, the client might be caching outdated server address information. Clearing the client-side RPC cache (if possible) might allow it to rediscover the server’s address.

4. Manual Configuration (if applicable):

   • If acceptable for your scenario, you might be able to manually configure the client to use a specific network address for the server, bypassing the need for address discovery through a name service.

5. Software Vendor Support:

   • If the issue persists, consider contacting the software vendor’s support for the program or service. They might have insights into server registration requirements or alternative connection methods.

Additional Tips:

• Some RPC development tools or libraries might offer functionalities to display details about UUIDs and network address resolution attempts.
• Debuggers or logging mechanisms can help capture details about the server UUID and any error messages related to address lookup failures.

By understanding the relationship between UUIDs, network addresses, and name services, you can identify the cause of the missing address error. Verifying server registration, consulting program documentation, clearing client cache (if applicable), using manual configuration (if applicable), and contacting software vendor support can help address this error.