NTSTATUS 0xC0020053 (RPC_NT_UNSUPPORTED_AUTHN

Status / error code:

Category:

Constant name:

Source:

Facility:

Operating System:

Description:

The requested RPC authentication level is not supported by the runtime, server, or transport path.

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RPC_NT_COMM_FAILURE	RPC_NT_NO_PRINC_NAME

RPC_NT_UNSUPPORTED_AUTHN_LEVEL

Unsupported RPC authentication level

RPC_NT_UNSUPPORTED_AUTHN_LEVEL 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.

RPC authentication levels describe how much protection is applied to the call, from connection-level checks through packet integrity and privacy. This status means the requested level cannot be used in the current configuration.

Check both sides. The client may request a level the server does not accept, or a server policy may require a level the client binding did not negotiate. DCOM/RPC hardening changes can make old clients fail here.

What to check

Log the requested and negotiated authentication level, not just the package name.
Check whether the protocol sequence supports the requested level.
For enterprise failures, compare affected and unaffected machines for RPC security policy and Windows update level.

References

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