Another incoming request attempts to exercise that SSO session with a different and often competing authentication requirement that may differ from the authentication level CAS has already established. Consider for a moment that CAS already has established an SSO session with/without a provider and has reached a level of authentication.

2f.U2FCoreMultifactorAuthenticationProperties.Īt times, CAS needs to determine the correct provider when step-up authentication is required. UNDEFINED: The default one indicating that no failure mode is set at all.PHANTOM: Disallow MFA, proceed with authentication and communicate MFA to the RP.CLOSED: Disallow MFA, block with authentication.OPEN: Disallow MFA, proceed with authentication but don't communicate MFA to the RP.Failure modes set at this location will override the global failure mode, but defer to any failure mode set by the registered service. Each defined multifactor authentication provider can set its own failure mode policy. You can of course change this behavior so that authentication proceeds without exercising the provider functionality, if that provider cannot respond. The authentication policy by default supports fail-closed mode, which means that if you attempt to exercise a particular provider available to CAS and the provider cannot be reached, authentication will be stopped and an error will be displayed. The failure mode policy for this MFA provider.

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