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RPC_S_SERVER_UNAVAILABLE
RPC_S_SERVER_UNAVAILABLE means that the RPC runtime could not make the required connection to the server. The code alone does not identify whether the cause is service availability, name resolution, endpoint discovery, a firewall, routing, or a transport mismatch.
Diagnose by stage
- Validate the server address and the protocol sequence in the binding.
- Check that the server process is running and has registered the expected interface and endpoint.
- Verify network reachability and firewall rules for the chosen transport, including endpoint mapper access where dynamic endpoints are used.
- Capture extended RPC error information when available; it can show the component and machine that detected the failure.
Microsoft: Finding Endpoints · Obtaining Extended RPC Error Information
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