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RPC_NT_SERVER_UNAVAILABLE
RPC_NT_SERVER_UNAVAILABLE is an NTSTATUS value used by the Windows RPC runtime. This status reports that the RPC server is unavailable. It is a reachability or service-availability outcome after the client has enough binding information to attempt communication. The result alone does not distinguish a stopped server, transport failure, endpoint loss or a path blocked between client and server.
It differs from RPC_NT_NO_ENDPOINT_FOUND, where endpoint resolution yields no usable endpoint, and from RPC_NT_SERVER_TOO_BUSY, where the server is available but cannot complete the operation because of load or capacity.
The client could not use the target RPC server
- Record the complete binding, selected endpoint, interface UUID and transport error from the same attempt.
- Verify server process/listener state and endpoint registration before changing client call timeouts.
- Correlate with network-path and server logs; do not infer that the procedure began executing from this status alone.
References
- Microsoft: RPC return values
- Microsoft: Client-side binding and endpoint discovery
- Microsoft: Server-side binding
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