Radiator Server Documentation — v10.34.2
Netlogon backend cannot verify authentication protocol
A Netlogon backend received a request it has no Active Directory logon for.
Emission
Log level: DEBUG
Per-request tracing: No
Promotion: WARN
Logged when a netlogon backend action runs for a request whose credentials use a protocol other
than PAP, MSCHAP or MSCHAPv2. Netlogon network logon only verifies NTLM challenge responses, which
Radiator can build only from these protocols, so the protocol field shows CHAP or an MSCHAPv2
password change. Requests that carry no credentials are ignored without this event.
Run the netlogon backend only for PAP, MSCHAP and MSCHAPv2 requests, and route the protocol in
protocol to a backend that can verify it.