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RPC_X_WRONG_PIPE_VERSION
What “pipe version” refers to
RPC_X_WRONG_PIPE_VERSION is a specialized RPC compatibility failure for an IDL pipe. A pipe is represented by generated code and runtime support rather than by an application-defined network message. The error indicates that the pipe support used for this call is not a version the receiving RPC implementation accepts.
This is narrower than a general connection or endpoint problem. The binding can be valid and ordinary RPC methods can still work while an operation containing a pipe parameter fails because its client proxy, server stub, or runtime support is from an incompatible build or deployment set.
Deployment situations worth checking
- Only one side was updated after an IDL or MIDL toolchain change, leaving stale generated stubs, proxy code, or a registered proxy-stub DLL in use.
- A component loads an older RPC-related binary from an application directory while another component was rebuilt for a newer interface package.
- Interface definitions were copied between products without keeping the generated headers, stubs, and registration artifacts from the same build.
- A compatibility layer implements the interface but does not implement the pipe feature required by the operation.
How it differs from nearby RPC errors
RPC_X_WRONG_STUB_VERSION concerns stub compatibility in general. This code directs the investigation to the pipe-bearing operation and its generated support. RPC_X_INVALID_PIPE_OBJECT instead suggests that the callback descriptor or state is invalid for a particular call. Neither code is a reason to tune packet size or assume that the payload itself is too large.
Compare the deployed interface UUID and version, MIDL-generated artifacts, proxy-stub registration where applicable, and the exact binaries loaded by both processes. Rebuilding from one IDL revision and deploying the client, server, and proxy together is safer than replacing individual generated files.
References
- Microsoft: MIDL pipe type
- The Open Group: DCE RPC IDL rules for pipe types
- Microsoft: system error codes 1700–3999
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