CC-SG will query the configured external authorization and authentication servers in the order that you specify. If the first checked option is unavailable, CC-SG will try the second, then the third, and so on, until it is successful.
To establish the order in which CC-SG uses external authentication and authorization servers:
Choose Administration > Security.
Click the Authentication tab. All configured external Authorization and Authentication Servers appear in a table.
Select a server from the list, and then click the up and down arrows to prioritize the order of engagement.