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RPC_NT_SEC_PKG_ERROR
RPC security package failure
RPC_NT_SEC_PKG_ERROR belongs to the Windows RPC runtime NTSTATUS facility. MS-RPCE extends the DCE/RPC model: generated stubs marshal parameters, the runtime binds to an endpoint and protocol sequence, and security or transport failures can be returned as RPC facility status values.
This status means RPC delegated part of authentication or protection to a security package, and that provider returned a package-specific failure. The root cause is often Kerberos, NTLM, Schannel, credentials, SPN, channel binding, or policy rather than endpoint availability.
Capture both the RPC status and the security-package status if possible. Without the provider-specific code, the diagnosis remains too generic.
What to check
- Identify the authentication service selected on the binding.
- Check SPN, credential, clock, trust, certificate, and policy events around the failure.
- For packet integrity or privacy failures, inspect whether intermediaries modify or terminate the protected stream.
References
- Microsoft RPC: client impersonation
- Microsoft RPC: authentication-level constants
- MS-RPCE: security context handle
- Microsoft Open Specifications: MS-RPCE overview
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