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RPC_S_INVALID_BINDING
RPC_S_INVALID_BINDING means that the API received a binding handle that is not valid for the requested RPC operation. It is a local handle-lifetime or handle-type problem, not evidence that the remote server is down.
Common causes
- The handle was never initialized because binding creation failed.
- The application already released it with
RpcBindingFree. - A pointer or a handle belonging to a different API was passed in its place.
- Concurrent cleanup invalidated a handle while another thread still used it.
What to do
Give each binding handle clear ownership, preserve the status from the function that created it, and prevent use after cleanup. Recreating the binding may be appropriate only after the local lifecycle bug has been corrected.
Microsoft: RpcBindingFromStringBinding · RPC Return Values
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