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RPC_NT_SS_CANNOT_GET_CALL_HANDLE
Stub cannot obtain the active RPC call handle
RPC_NT_SS_CANNOT_GET_CALL_HANDLE is raised inside generated stub support when code that needs the current call handle cannot retrieve it. That usually means the helper is running outside the expected RPC call path or the call context has already ended.
The status is useful when debugging server-side helper code, pipes, callbacks, or context-handle rundown paths that assume an active RPC call. A normal binding handle can exist while there is no current call handle for the stub helper to use.
What to check
- Identify whether the failing path runs inside a manager routine, callback, pipe transfer function, or deferred worker.
- Check that helper routines needing call-specific state are not invoked after the RPC call has returned.
- Compare generated stub version and runtime version if this appears after rebuilding IDL or changing compiler options.
References
- Microsoft MIDL: context_handle attribute
- The Open Group: DCE RPC context handles
- Microsoft RPC: handles
- Microsoft Open Specifications: MS-RPCE overview
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