If the current primary cluster server is down and will be down for an extended period of time, you must select another server to be the primary cluster server.
On the Home page, click Access Gateways > [cluster name]> Edit.
In the Primary Server list, select the name of a server, then click OK.
Wait until this configuration change has completed, before doing any other configuration updates.
To update Identity Server, on the Home page, click Identity Servers > Update All for that cluster.