Fixing Win32 Error 0x000006A7 (RPC_S_PROTSEQ_NOT_SUPPORTED)

The error code 0x000006A7 translates to RPC_S_PROTSEQ_NOT_SUPPORTED. This error message indicates that the Remote Procedure Call (RPC) communication protocol specified in the binding string is not supported by the remote service or program you’re trying to connect to.

Understanding Unsupported RPC Protocols:

• RPC can utilize different protocols for communication, like TCP or named pipes. The protocol selection depends on the capabilities of the remote service and the configuration of the RPC connection.
• The RPC_S_PROTSEQ_NOT_SUPPORTED error occurs when the binding string specifies a protocol that the remote service doesn’t support or isn’t configured to use.

Reasons Behind RPC_S_PROTSEQ_NOT_SUPPORTED:

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

• Incorrect Protocol Specified: The binding string might be using a protocol that’s not supported by the remote service you’re trying to access.
• Outdated Configuration: The program or service configuration on either your computer or the remote system might be outdated and not configured for the desired protocol.

Resolving RPC_S_PROTSEQ_NOT_SUPPORTED:

1. Review Binding String Protocol:

   • Check the binding string to identify the communication protocol specified. Consult the documentation for the remote service to see if it supports that specific protocol.

2. Verify Program or Service Configuration (if applicable):

   • If you have access to the configuration settings of the program or service on either your computer or the remote system, see if there are options to specify the communication protocol for RPC connections.

3. Software Vendor Support:

   • If you’re unsure about the supported protocols or encounter configuration issues, consider reaching out to the software vendor’s support for the program or service you’re trying to access remotely. They can provide information on supported protocols and how to establish a compatible RPC connection.

4. Explore Alternative Binding Options (if possible):

   • In some cases, the program or service you’re using might allow specifying alternative binding options during the RPC connection setup. Explore if there are options to choose a different supported protocol.

Additional Tips:

• Some RPC tools or libraries might offer options to automatically negotiate the communication protocol with the remote service. Consider using such tools if available to simplify the connection process.
• If you manage network configurations, ensure that the necessary ports for the supported RPC protocol are open for communication between your computer and the remote system.

By understanding the role of communication protocols in RPC and the reasons behind the RPC_S_PROTSEQ_NOT_SUPPORTED error, you can identify the protocol incompatibility issue. Reviewing the binding string protocol, verifying program or service configuration (if applicable), consulting software vendor support, exploring alternative binding options (if possible), and checking network configurations are some recommended steps to address this error.