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The server operating system MUST first assemble the NETLOGON_TICKET_LOGON_INFO structure ([MS-NRPC] section 2.2.1.4.19) by copying the service Ticket that the server operating system is to verify. The message type field MUST be set to 0x00000026 to make the server operating system ready to contact the DC.
This exchange MUST be layered on top of the Netlogon generic pass-through ([MS-NRPC] section 3.2.4.1). The server operating system MUST supply a NETLOGON_TICKET_LOGON_INFO structure, packed as a single buffer, as the LogonData field. The PackageName field MUST be set to a UNICODE_STRING with a buffer of Kerberos.
If the DC cannot be reached, Netlogon ([MS-NRPC] section 3) MUST return the error STATUS_NO_LOGON_SERVERS (section 2.2). The server operating system SHOULD fail the authentication attempt.