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RPC_NT_UNSUPPORTED_NAME_SYNTAX
The name syntax is not available in this environment
This status is different from invalid syntax. The syntax value can be recognizable, but the installed RPC runtime or selected name-service provider does not implement it.
For diagnostics, confirm the Windows version, RPC name service provider and deployment assumptions. The fix is often to use a supported naming model or a direct binding/endpoint mapper path instead of the unsupported name service.
What to inspect
- Compare the requested name syntax with what the target platform supports.
- Check whether the code can use endpoint mapper lookup instead.
- Do not retry the same name syntax without changing provider or configuration.
References
- Microsoft: RPC name service entry overview
- Microsoft: Specifying RPC endpoints
- Microsoft Open Specifications: NTSTATUS values
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