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RPC_S_SEC_PKG_ERROR
RPC_S_SEC_PKG_ERROR means that the security package returned an error for which RPC has no more specific status mapping. The useful cause is therefore in the security provider's own error data, not in this generic RPC code.
What to do first
- Preserve the original RPC status and collect extended RPC error information immediately.
- Check the selected authentication service, principal name, credentials, certificate or domain trust according to the security package in use.
- Correlate client and server security logs before changing protocol or retry settings.
Why extended errors matter
Extended RPC error records can identify the layer that detected the error and carry provider-specific status data. They are the intended diagnostic path for this code.
Microsoft: RPC Return Values · Obtaining Extended RPC Error Information
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