gravitational/teleport · error

webauthn error code %v: %v

Error message

webauthn error code %v: %v

What it means

getErrorNameOrLastErr formats failures from the native Windows WebAuthn API: if WebAuthNGetErrorName cannot produce a message for the HRESULT, the raw error code (plus syscall error, if any) is formatted into this message.

Source

Thrown at lib/auth/webauthnwin/webauthn_windows.go:227

		AttestationResponse: wantypes.AuthenticatorAttestationResponse{
			AuthenticatorResponse: wantypes.AuthenticatorResponse{
				ClientDataJSON: in.jsonEncodedClientData,
			},
			AttestationObject: bytesFromCBytes(out.cbAttestationObject, out.pbAttestationObject),
		},
	}, nil
}

func getErrorNameOrLastErr(in uintptr, lastError error) error {
	ret := webAuthNGetErrorName(in)
	if ret == 0 {
		if lastError != syscall.Errno(0) {
			return fmt.Errorf("webauthn error code %v and syscall err: %v", in, lastError)
		}
		return fmt.Errorf("webauthn error code %v", in)
	}
	errString := windows.UTF16PtrToString((*uint16)(unsafe.Pointer(ret)))
	return fmt.Errorf("webauthn error code %v: %v", in, errString)
}

func isUVPlatformAuthenticatorAvailable() (bool, error) {
	var out bool
	ret, err := webAuthNIsUserVerifyingPlatformAuthenticatorAvailable(&out)
	if err != nil {
		return false, getErrorNameOrLastErr(ret, err)
	}
	return out, nil
}

// bytesFromCBytes gets slice of bytes from C type and copies it to new slice
// so that it won't interfere when main objects is free.
func bytesFromCBytes(size uint32, p *byte) []byte {
	if p == nil {
		return nil
	}
	if *p == 0 {

View on GitHub (pinned to 1283425b60)

Solutions

1. Look up the WebAuthn HRESULT code in Microsoft's WebAuthN documentation to identify the failure
2. Verify the authenticator and Windows version support WebAuthn
3. Retry the operation; some codes are transient (e.g. user cancellation or timeout)

When it happens

Trigger: Thrown at lib/auth/webauthnwin/webauthn_windows.go:227 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of gravitational/teleport@1283425b60 (2026-09-02). Data as JSON: /api/errors/53a72a7c7f3d9da3. Report an issue: GitHub.