Hi, I would have a cold failover of Crowd ready. Set a low TTL on the DNS. You can literally failover in 5-10mins without any issues that way. Would solve most of the problems.
You can set the cache to longer. By default it's 1 hour isn't it? Unless you've changed it.
The downside of a longer cache is taking longer to propagate though you can manually refresh if you know there's a change you need to be picked up.
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