Fixing Win32 Error 0x000006B2 (RPC_S_NO_PROTSEQS_REGISTERED)

The error code 0x000006B2 translates to RPC_S_NO_PROTSEQS_REGISTERED. This error message indicates that the RPC system couldn’t find any registered protocol sequences that are compatible with the binding string you’re using for a Remote Procedure Call (RPC) connection.

Understanding Missing Protocol Sequences:

• RPC communication can utilize different protocol sequences for data transfer. These sequences define how data is packaged and transmitted between client and server.
• The binding string used for an RPC connection specifies the desired protocol sequence.
• The RPC_S_NO_PROTSEQS_REGISTERED error occurs when the RPC system cannot locate any protocol sequences on the server that are compatible with the one specified in the binding string.

Reasons Behind RPC_S_NO_PROTSEQS_REGISTERED:

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

• Incorrect Protocol Sequence Specified: The binding string might be using a protocol sequence that’s not supported or registered on the server.
• Outdated Server Configuration (rare): In rare cases, the server-side RPC configuration might be outdated or corrupted, leading to missing or incompatible protocol sequence registrations.

Resolving RPC_S_NO_PROTSEQS_REGISTERED:

1. Verify Binding String Protocol Sequence:

   • Carefully examine the protocol sequence specified within the binding string. Ensure it’s a valid and supported protocol sequence on the remote server you’re trying to connect to.

2. Consult Program Documentation:

   • Refer to the documentation for the program or service you’re trying to access remotely. It should specify the supported protocol sequences for RPC connections.

3. Software Vendor Support:

   • If you’re unsure about the supported protocol sequences or encounter issues with the remote service configuration, consider reaching out to the software vendor’s support for the program or service you’re trying to access remotely. They can provide guidance on compatible protocol sequences and potential configuration issues on the server.

4. Review Server-Side Configuration (if applicable):

   • If you have access to server administration tools, check the RPC configuration on the server to see if the necessary protocol sequences are registered and enabled.

5. Explore Alternative Protocol Sequences (if possible):

   • In some cases, the program or service you’re using might allow specifying alternative protocol sequences in the binding string. Explore the documentation or configuration options to see if there are compatible alternatives you can try.

Additional Tips:

• Some RPC tools or libraries might offer features to help with protocol sequence selection during connection setup. These tools might suggest compatible protocol sequences based on server capabilities.
• If managing the server-side configuration, ensure that the RPC system is configured to support and register the commonly used protocol sequences required for various RPC applications.

By understanding the role of protocol sequences in RPC and the reasons behind the RPC_S_NO_PROTSEQS_REGISTERED error, you can identify the cause of the missing compatible protocol sequence. Carefully verifying the binding string protocol sequence, consulting program documentation, contacting software vendor support, reviewing server-side configuration (if applicable), exploring alternative protocol sequences (if possible), and maintaining a healthy server-side RPC configuration can help address this error.