iRules Recipe 4: Static Maintenance Page
Updated Jun 06, 2023
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LB_FAILED does not mean "all pool members are down". Rather, it means "a load-balancing decision cannot be made, or an attempt to proxy the traffic failed". Usually, the first happens when all members are down, but the second can occur for a variety of reasons. For example, if the pool members becomes overloaded and TCP connections timeout, then LB_FAILED will be raised.